WILDERNESS MEDICINE WILDERNESS MEDICINE Sixth Edition Paul S. Auerbach, MD, MS, FACEP, FAWM Redlich Family Professor of Surgery Division of Emergency Medicine Department of Surgery Stanford University School of Medicine Stanford, California 1600 John F. Kennedy Blvd. Ste 1800 Philadelphia, PA 19103-2899 WILDERNESS MEDICINE ISBN: 978-1-4377-1678-8 Copyright © 2012, 2007, 2001, 1995, 1989, 1983 by Mosby, an imprint of Elsevier Inc. Chapter 83 © 2012 by Michael E. Jacobs and Charles G. Hawley Chapter 3 all figures, tables, and photographs © Dr. Mary Ann Cooper Chapter 29 photographs © Dr. Grant S. Lipman, Elsevier granted non-exclusive license to publish Chapter 20 © Swaminatha Mahadevan No part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying, recording, or any information storage and retrieval system, without permission in writing from the publisher. 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Library of Congress Cataloging-in-Publication Data Wilderness medicine / [edited by] Paul S. Auerbach.—6th ed. p. ; cm. Includes bibliographical references and index. ISBN 978-1-4377-1678-8 (hardcover : alk. paper) I. Auerbach, Paul S. [DNLM: 1. Wilderness Medicine. 2. Emergency Treatment—methods. 3. Environmental Exposure. 4. Recreation. 5. Rescue Work. 6. Survival. WB 107] LC classification not assigned 616.9′8—dc23 2011032078 Acquisitions Editors: Dolores Meloni and Stefanie Jewell-Thomas Developmental Editor: Lucia Gunzel Publishing Services Manager: Anne Altepeter Associate Project Manager: Jessica Becher Design Direction: Steve Stave Working together to grow libraries in developing countries Printed in China www.elsevier.com | www.bookaid.org | www.sabre.org Last digit is the print number: 9 8 7 6 5 4 3 2 1 Contributors Javier A. Adachi, MD, FIDSA, FACP Aaron L. Baggish Associate Professor, Department of Infectious Diseases, Infection Associate Director, Cardiovascular Performance Program, Divi- Control, and Employee Health, The University of Texas MD sion of Cardiology, Harvard Medical School, Massachusetts Anderson Cancer Center; Adjunct Professor, The University of General Hospital, Boston, Massachusetts Texas Health Science Center at Houston, Medical School and School of Public Health; Adjunct Professor, Baylor College Jennifer G. Baine, MD of Medicine, Houston, Texas; Visiting Professor, Universidad Clinical Instructor, Division of Emergency Medicine, Stanford Peruana Cayetano Heredia, Lima, Peru University School of Medicine, Stanford, California Martin E. Alexander, BScF, MSc, PhD, RPF Buddha Basnyat, MD, MSc, FACP, FRCP(E) Adjunct Professor, Wildland Fire Science and Management, Medical Director, Nepal International Clinic, Himalayan Rescue Department of Renewable Resources, Alberta School of Forest Association; Principal Investigator, Oxford University Clinical Science and Management, University of Alberta; Honorary Research Unit, Patan Academy of Health Sciences, Kathmandu, Research Associate, Faculty of Forestry and Environmental Nepal Management, University of New Brunswick, Fredericton, New Brunswick, Canada; Senior Fire Behavior Research Officer (Retired), Canadian Forest Service, Northern Forestry Centre, Ryan P. Bayley, MD Edmonton, Alberta, Canada Resident Physician, Emergency Medicine, New York-Presbyterian Weill Cornell Medical Center and Columbia University Medical Robert C. Allen, DO, FACEP Center, New York, New York Colonel, United States Air Force MC CFS (Retired), Contingency Operations Division, United States Air Force School of Aero- Greta J. Binford, PhD space Medicine, Brooks City, Texas Associate Professor of Biology, Lewis and Clark College, Port- land, Oregon Susan Anderson, MD, MS Clinical Associate Professor, Division of Infectious Diseases and Nicholas H. Bird, BA, MD, DABFM, DABPM Geographic Medicine, Stanford University, Stanford, California; CEO and Chief Medical Officer, Divers Alert Network, Durham, Travel, Tropical, and Wilderness Medicine Consultant, Travel North Carolina Medicine and Emergency/Urgent Care, Palo Alto Medical Foun- dation, Palo Alto, California Ryan Blumenthal, MBChB (Pret), MMed (Med Forens) Pret, FC for Path (SA), Christopher J. Andrews, BE, MBBS, MEngSc, Dip For Med (SA) PhD, JD, EDIC, DipCSc, GDLP Forensic Pathologist, Department of Forensic Medicine, Univer- Mt Ommaney Family Clinic, Australia sity of Pretoria, Pretoria, Gauteng, South Africa E. Wayne Askew, PhD Jolie Bookspan, MEd, PhD, FAWM Colonel, United States Army MSC (Retired), Professor and Chair, Medical Director, Neck and Back Pain Sports Medicine, Academy Division of Nutrition, University of Utah, Salt Lake City, Utah of Functional Exercise Medicine, Temple University, Philadel- phia, Pennsylvania Dale Atkins, BA President, American Avalanche Association; Vice President, Ava- Ralph S. Bovard, MD, MPH, FACSM lanche Rescue Commission; International Commission for Department of Occupational and Environmental Medicine, Alpine Rescue, North America Training and Education Manager, HealthPartners, St. Paul, Minnesota RECCO, AB, Boulder, Colorado Warren D. Bowman, MD, FACP Paul S. Auerbach, MD, MS, FACEP, FAWM Clinical Associate Professor Emeritus, Department of Internal Redlich Family Professor of Surgery, Division of Emergency Medi- Medicine, University of Washington School of Medicine, cine, Department of Surgery, Stanford University School of Seattle, Washington; Staff Physician (Retired), Department of Medicine, Stanford, California Internal Medicine, Division of Hematology-Oncology, The Bill- ings Clinic, Billings, Montana Kira Bacal, MD, PhD, MPH, FACEP Phase 2 Director, Medical Programme Directorate, University of Leslie V. Boyer, MD Auckland, Auckland, New Zealand Director, Venom Immunochemistry, Pharmacology, and Emer- gency Response Institute; Associate Professor of Pathology, Howard D. Backer, MD, MPH University of Arizona, Tucson, Arizona Director, California Emergency Medical Services Authority v John E. Bradford, RN, MPAS, PA-C Charles Clarke, MA, MBBCh, FRCP S R O Peace Corps Medical Officer, United States Peace Corps, Malawi, Honorary Consultant Neurologist, National Hospital for Neurol- T Lilongwe, Malawi, Africa; Clinical Adjunct Professor, University ogy and Neurosurgery, Queen Square, London, United U B of Utah Physician Assistant Program, Salt Lake City, Utah Kingdom RI T N O Mark A. Brandenburg, MD Kenneth S. Cohen, MA, MSTh C Medical Director, Emergency Department, Bristow Medical Independent Scholar, Traditional Healer, Nederland, Colorado Center, Bristow, Oklahoma; Medical Director, Emergency Medical Services, Tulsa Technology Center, Tulsa, Oklahoma Stephen D. Coleman, MD Clinical Assistant Professor, Department of Anesthesia, Pain Man- Beau Briese, MD agement Division, Stanford University School of Medicine, Resident Physician, Division of Emergency Medicine, Stanford/ Stanford, California Kaiser Emergency Medicine Residency Program, Stanford Uni- versity, Stanford, California Bryan R. Collier, DO, FACS, CNSP Assistant Professor of Surgery, Division of Trauma and Surgical Colin M. Bucks, MD Critical Care, Vanderbilt University Medical Center, Nashville, Clinical Instructor, Division of Emergency Medicine, Department Tennessee of Surgery, Stanford University School of Medicine, Stanford, California Shon Compton, MPAS, PA-C Major, Specialty Corps (Retired), Chief Instructor, Center for George H. Burgess Predeployment Medicine, United States Army Medical Depart- Florida Program for Shark Research, Florida Museum of Natural ment Center and School, Fort Sam Houston, Texas History, University of Florida, Gainesville, Florida Benjamin B. Constance, MD Sean P. Bush, MD, FACEP Chief Resident Physician, Division of Emergency Medicine, Professor of Emergency Medicine, Loma Linda University School Stanford/Kaiser Emergency Medicine Residency Program, Stan- of Medicine, Loma Linda, California ford University, Stanford, California Frank K. Butler Jr., BS, MD Donald C. Cooper, PhD, MBA, EMT-P Chairman, Committee on Tactical Combat Casualty Care, Defense State Fire Marshal, Department of Commerce, State of Ohio, Health Board, Pensacola, Florida Columbus, Ohio Dale J. Butterwick, ATC(C), BA, MSc Jimmy L. Cooper, MD, FACEP Associate Professor, Faculty of Kinesiology, University of Calgary; Staff Physician, Department of Emergency Medicine, Director, Former President, Canadian Pro Rodeo Sport Medicine Team, Center for Predeployment Medicine, San Antonio, Texas Calgary, Alberta, Canada Mary Ann Cooper, MD, FAMS, FAAEM Steven C. Carleton, MD, PhD Emerita Professor, Department of Emergency Medicine, Univer- Professor, Department of Emergency Medicine, University of sity of Illinois College of Medicine, Chicago, Illinois Cincinnati College of Medicine, Cincinnati, Ohio Kevin Coppock, BSc, MSc Betty Carlisle, MD Head of Mission, Northern Sudan, Médecins Sans Frontières, Adjunct Assistant Professor, Department of Public Health and Khartoum, Sudan Preventive Medicine, State University of New York Upstate Medical University; Staff Physician, Emergency Department, St. Larry I. Crawshaw, PhD Joseph’s Hospital, Syracuse, New York Professor Emeritus, Department of Biology, Portland State University, Department of Behavioral Neuroscience, Oregon Scott P. Carroll, PhD Health and Science University, Portland, Oregon Department of Entomology, University of California, Davis, California Joy E. Crook, MD, MPH Instructor, Department of Emergency Medicine, Johns Hopkins John W. Castellani, PhD School of Medicine, Baltimore, Maryland Research Physiologist, Thermal and Mountain Medicine Division, United States Army Research Institute of Environmental Medi- Gregory A. Cummins, DO, MS cine, Natick, Massachusetts Assistant Clinical Instructor, Department of Internal Medicine, Kansas University of Medicine and Biosciences; Hospitalist, Samuel N. Cheuvront, PhD Department of Medicine, North Kansas City Hospital, Kansas Research Physiologist, Division of Thermal and Mountain Medi- City, Missouri cine, United States Army Research Institute of Environmental Medicine, Natick, Massachusetts Tracy A. Cushing, MD, MPH, FACEP, FAWM Assistant Professor, Department of Emergency Medicine, Univer- Richard F. Clark, MD sity of Colorado School of Medicine, Aurora, Colorado; Attend- Professor of Clinical Medicine, Director, Division of Medical ing Physician, Fellowship Director, Denver Health Wilderness Toxicology, University of California, San Diego, San Diego, Medicine Fellowship, Department of Emergency Medicine, California Denver Health Medical Center, Denver, Colorado vi Jon Dallimore, MB, BS, MSc, MRCGP, MCEM, Herbert L. DuPont, MD C FFTM RCPS (Glasg), DCH, DRCOG Professor and Director, Center for Infectious Diseases, University ON of Texas School of Public Health and Medical School; Chief of T Specialty Doctor, Emergency Department, Bristol Royal Infirmary, R Bristol, United Kingdom Internal Medicine, St. Luke’s Episcopal Hospital; Vice Chair- IB man, Department of Medicine, Baylor College of Medicine, U T Houston, Texas O Daniel F. Danzl, MD R S Professor and Chair, Department of Emergency Medicine, Uni- Blair Dillard Erb, BS, MD, FACP, FACC versity of Louisville School of Medicine, Louisville, Kentucky Past President, Wilderness Medical Society, The Study Center, Townsend, Tennessee Ian Davis, MBBCH, BSc (Hons) Resident Medical Officer, Department of Accident and Emer- Timothy B. Erickson, MD gency, Cirencester Hospital, Gloucestershire; Polar Medicine, Professor, Department of Emergency Medicine, Division of Medical Cell, Royal Geographical Society, London; Chief Medical Toxicology; Director, Center for Global Health, Uni- Medical Officer, Polar Challenge, Venture Group, Cirencester, versity of Illinois College of Medicine, Chicago, Illinois England, United Kingdom Charles D. Ericsson, MD Kathleen Mary Davis, BScF, MSc Professor of Medicine, Head, Clinical Infectious Disease, Division Superintendent, Montezuma Castle and Tuzigoot National Monu- of Infectious Disease, Department of Internal Medicine, Uni- ment, National Park Service, Camp Verde, Arizona versity of Texas Medical School at Houston, Houston, Texas Kevin Davison, ND, Lac Peter J. Fagenholz, MD Director, Maui Prolotherapy Clinic, Hamakuapoko, Peahi, Haiku, Department of Surgery, Division of Trauma, Emergency Surgery, Maui, Hawaii and Critical Care, Massachusetts General Hospital; Instructor in Surgery, Harvard Medical School, Boston, Massachusetts Chad P. Dawson, BS, MPS, PhD Professor, Forest and Natural Resources Management, State Uni- Joanne N. Feldman, MD, MS versity of New York College of Environmental Science and Clinical Faculty, Division of Emergency Medicine, University of Forestry, Syracuse, New York California, Los Angeles, Los Angeles, California Janice A. Degan, RN, MS D. Nelun Fernando, BA, MA, PhD Senior Research Nurse, Venom Immunochemistry, Pharmacology, Department of Geography, Rutgers University, New Brunswick, and Emergency Response Institute, Arizona Health Sciences New Jersey Center, University of Arizona, Tucson, Arizona Murray E. Fowler, BS, DVM Thomas G. DeLoughery, MD, FACP Professor Emeritus, Veterinary Medicine and Epidemiology, Professor of Medicine, Pathology, and Pediatrics, Head, Benign University of California, Davis, California Hematology Section, Oregon Health and Science University, Portland, Oregon Mark S. Fradin, MD Arlene E. Dent, MD, PhD Clinical Associate Professor, Department of Dermatology, Univer- sity of North Carolina School of Medicine, Chapel Hill, North Assistant Professor, Department of Pediatrics, Case Western Carolina Reserve University School of Medicine, Cleveland, Ohio Michael E. Franco, Major, MSM, MPAS, PA-C Thomas F. Ditzler, PhD, MA, FRSPH, FRAI Chief, Plans and Operations, United States Army Environmental Director of Research, Department of Psychiatry, Tripler Army Management Systems Programs Office, United States Army Medical Center, Honolulu, Hawaii Medical Department Center and School, Fort Sam Houston, Texas Mark Donnelly, MD Salem Emergency Department, Salem, Oregon Luanne Freer, MD, FACEP, FAWM Medical Director, Medcor, Yellowstone National Park, Wyoming; Howard J. Donner, MD Founder and Director, Everest Base Camp Medical Clinic, Wilderness Medicine Instructor, Mountain Medical Seminars, Himalayan Rescue Association, Kathmandu, Nepal Bozeman, Montana; Adventure Training Coordinator, The Finer Points of Flying, San Francisco, California Steven P. French, MD, BS, MS, IUCN, ASNE, SFW Eric Douglas, BA, EMT, DMT Co-founder and Research Director, Yellowstone Grizzly Founda- Director, Education, Divers Alert Network, Durham, North tion, Jackson Hole, Wyoming Carolina Nathan K. Friedline, MD Jennifer Dow, MD, FACEP, FAWM Resident, Division of Emergency Medicine, University of Utah, Medical Director, Denali National Park and Preserve; Medical Salt Lake City, Utah; Captain, United States Army, 32nd Medical Director, National Park Service, Alaska Region, Department of Brigade, Fort Sam Houston, Texas Emergency Medicine, Alaska Regional Hospital, Anchorage, Alaska vii Raymond R. Gaeta, MD Charles G. Hawley, BS S R O Associate Professor, Department of Anesthesiology, Medical Vice President, West Marine, Safety at Sea Moderator, United T Director, Pain Management Service, Stanford University School States Sailing Technical Board Member, American Boat and U B of Medicine, Stanford, California Yacht Council, Santa Cruz, California RI T N O Tom Garrison, BS, MA, PhD David M. Heimbach, MD C Professor, Department of Oceanography, Orange Coast College, Professor of Surgery, University of Washington School of Medi- Costa Mesa, California; Adjunct Professor, Higher Education, cine, Seattle, Washington University of Southern California, Los Angeles, California Carlton E. Heine, MD, PhD, FACEP, FAWM Daniel Garza, MD Clinical Instructor, University of Washington School of Medicine, Assistant Professor, Department of Orthopaedic Surgery, Division Seattle, Washington; Attending Physician, Emergency Depart- of Emergency Medicine, Stanford University School of Medi- ment, Bartlett Regional Hospital, Juneau, Alaska cine, Stanford, California Lawrence E. Heiskell, MD, FACEP, FAAFP Alan Gianotti, MS, MD International School of Tactical Medicine, Palm Springs, Clinical Assistant Professor, Division of Emergency Medicine, California Stanford University School of Medicine, Stanford, California John C. Hendee, PhD Gordon G. Giesbrecht, BPE, BTh, MPE, PhD Emeritus Professor and Dean (Retired), University of Idaho, Professor of Thermophysiology, Health Leisure and Human Per- College of Natural Resources, Moscow, Idaho formance Research Institute, University of Manitoba; Professor, Department of Anesthesia, University of Manitoba, Winnipeg, Henry J. Herrmann, DMD, FAGD Manitoba, Canada Dentist, Falls Church, Virginia Kimberlie A. Graeme, BS, MD Ronald L. Holle, BS, MS Division of Emergency Medicine, Naval Medical Center San Meteorologist, Holle Meteorology and Photography, Oro Valley, Diego, San Diego, California Arizona Colin K. Grissom, MD Renee Y. Hsia, MD, MSc Associate Professor of Medicine, University of Utah School of Assistant Professor, Department of Emergency Medicine, Univer- Medicine; Associate Medical Director, Shock Trauma Intensive sity of California, San Francisco; Attending Physician, Depart- Care Unit, Intermountain Medical Center, Murray, Utah ment of Emergency Services, San Francisco General Hospital, San Francisco, California Kirby R. Gross, MD, FACS Trauma Services, United States Army Medical Department, Walter Franklin R. Hubbell, DO Reed Army Medical Center, Washington, DC Physician and Director, Urgent Care and Spine Center, Saco River Medical Group; Physician, Director of Education, Peter H. Hackett, MD Stonehearth Open Learning Opportunities Schools; Author, Clinical Professor of Surgery, Department of Emergency Medi- Wilderness Medicine Newsletter, TMC Books, Conway, New cine, Altitude Research Center, University of Colorado Denver Hampshire School of Medicine, Denver, Colorado; Director, Institute for Altitude Medicine, Telluride, Colorado Stephen E. Hudson, CEO, NTC National Training Coordinator, National Cave Rescue Commis- N. Stuart Harris, MD sion, National Speleological Society, Huntsville, Alabama; Pres- Chief, Division of Wilderness Medicine, Director, Wilderness ident, Pigeon Mountain Industries, Lafayette, Georgia Medicine Fellowship, Department of Emergency Medicine, Massachusetts General Hospital; Assistant Professor of Surgery, Cynthia L. Idzik-Starr, DDS Harvard Medical School, Boston, Massachusetts Assistant Professor, Director of Urgent Care, Department of Oral and Maxillofacial Surgery, University of Maryland Dental Patricia R. Hastings, DO, MPH, FACEP, RN, School, Baltimore, Maryland NREMT Colonel, Medical Corps, United States Army; MEDCOM Liaison, Christopher H.E. Imray, PhD, MB, BS, DiMM, Department of Homeland Security, Washington, DC, Depart- Clin Med Sci, FRCS, FRCP ment of Emergency Medicine, Brooke Army Medical Center, Professor of Surgery, Warwick Medical School, Department of San Antonio, Texas Vascular Surgery, University Hospitals Coventry and Warwick- shire NHS Trust, Coventry, United Kingdom Seth C. Hawkins, MD, FACEP, FAWM Director, Mountain Emergency Physicians; Medical Director, Kenneth V. Iserson, MD, MBA, FACEP, Burke Emergency Medical Services Special Operations Team; Executive Director, Appalachian Center for Wilderness Medi- FAAEM, FIFEM cine, Morganton, North Carolina; Assistant Professor, Emer- Professor Emeritus, Department of Emergency Medicine, The gency Medical Care Program, Western Carolina University, University of Arizona, Tucson, Arizona Cullowhee, North Carolina viii Michael Jacobs, MD, FAWM Brian J. Krabak, MD, MBA C United States Coast Guard Licensed Captain; Founder and Clinical Associate Professor, Department of Rehabilitation, O N Program Director, MedSail (Medicine for Mariners and Safety Orthopedics, and Sports Medicine; Team Physician, Seattle T R at Sea); Medical Director, Vineyard Medical Services, Martha’s Children’s Sports Medicine, Seattle University Athletics, Univer- IB Vineyard, Massachusetts sity of Washington; Team Physician, USA Swimming; Medical U T Director, RacingThePlanet: 4 Deserts Ultra Marathon Series, O R Ramin Jamshidi, MD Seattle, Washington S Fellow, Department of Pediatric Surgery, Children’s Hospital of Wisconsin; Clinical Instructor, Department of Surgery, Medical Andrew C. Krakowski, MD College of Wisconsin, Milwaukee, Wisconsin; Adjunct Profes- Pediatrician and Dermatologist, Rady Children’s Hospital of San sor, Physics Department, University of California, San Fran- Diego, University of California, San Diego, San Diego, Califor- cisco, San Francisco, California nia; Founder and Director, boonDOCS Wilderness and Travel Medicine, La Jolla, California James M. Jeffers, BA, LLB, LLM, MPhil PhD Candidate, Department of Geography, Rutgers University, Peter Kummerfeldt, AD New Brunswick, New Jersey President, OutdoorSafe, Former Survival Training Director, United States Air Force Academy, Colorado Springs, Colorado Jamie G. Jenkins, MD Ultrasound Fellow, Department of Emergency Medicine, Wash- Ashley R. Laird, MD ington Hospital Center, Georgetown University Hospital, Union Emergency Physician, Sonora Regional Medical Center, Sonora, Memorial Hospital, Washington, DC California Kirsten Johnson, MD, MPH, CCFP-EM Carolyn S. Langer, MD, JD, MPH Assistant Professor, Department of Family Medicine; Director, Instructor, Harvard School of Public Health, Boston, University Humanitarian Studies Initiative; Affiliated Faculty, Massachusetts Institute for Health and Social Policy, McGill University, Mon- treal, Canada; Affiliated Faculty, Harvard Humanitarian Initia- Patrick H. LaValla tive, Harvard University, Cambridge, Massachusetts CEO, ERI International; Operations Chief, All Hands Consulting; Former President, National Association for Search and Rescue, Hemal K. Kanzaria, MD Olympia, Washington Resident Physician, Department of Emergency Medicine, Univer- sity of California, San Francisco, San Francisco General Hospi- Jay Lemery, MD, FACEP, FAWM tal, San Francisco, California Assistant Professor, Weill Cornell Medical College; Attending Physician, New York Presbyterian Hospital; President-Elect, Lee A. Kaplan, MD Wilderness Medical Society; Visiting Scientist, François-Xavier Clinical Professor, Department of Dermatology, University of Bagnoud Center for Health and Human Rights, Harvard School California, San Diego Health System, La Jolla, California of Public Health, Boston, Massachusetts Misha R. Kassel, MD Lisa R. Leon, PhD Clinical Instructor, Departments of Emergency Medicine and Research Physiologist, Thermal and Mountain Medicine Division, Orthopaedic Surgery, Stanford University School of Medicine, United States Army Research Institute of Environmental Medi- Stanford, California cine, Natick, Massachusetts Stephanie Kayden, MD, MPH Benjamin D. Levine, MD, FACC, FACSM Director, Harvard International Emergency Medicine Fellowship; Director, Institute for Exercise and Environmental Medicine; S. Attending Physician, Brigham and Women’s Hospital; Instruc- Finley Ewing Jr., Chair for Wellness, Texas Health Presbyterian tor, Harvard Medical School; Faculty, Harvard Humanitarian Dallas; Harry S. Moss Heart Chair for Cardiovascular Research; Initiative, Boston, Massachusetts Professor of Medicine and Cardiology, Distinguished Profes- sorship in Exercise Science, University of Texas Southwestern James W. Kazura, MD Medical Center at Dallas, Dallas, Texas Professor of International Health and Medicine, Center for Global Health and Diseases, Case Western Reserve University School Matthew R. Lewin, MD, PhD, FACEP of Medicine, Cleveland, Ohio Director, Center for Exploration and Travel Heath, California Academy of Sciences, San Francisco, California Robert W. Kenefick, PhD Research Physiologist, Thermal and Mountain Medicine Division, James R. Liffrig, MD, MPH, FAAFP United States Army Research Institute of Environmental Medi- Chair, Department of Family Medicine, Womack Army Medical cine, Natick, Massachusetts Center, Fort Bragg, North Carolina; Assistant Professor of Medi- cine, Uniformed Services University of the Health Sciences, Alexa B. Kimball, MD, MPH Bethesda, Maryland Vice Chair, Department of Dermatology, Massachusetts General Hospital; Associate Professor, Harvard Medical School, Boston, Grant S. Lipman, MD, FACEP Massachusetts Clinical Assistant Professor, Division of Emergency Medicine, Department of Surgery, Stanford University School of Medicine, Judith R. Klein, MD, FACEP Stanford, California Assistant Professor, Department of Emergency Medicine, Univer- sity of California, San Francisco, San Francisco General Hospi- tal, San Francisco, California ix
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