Ballenger’s Manual of Otorhinolaryngology Head and Neck Surgery James B. Snow Jr, MD Professor Emeritus, University of Pennsylvania School of Medicine Philadelphia, Pennsylvania Former Director, National Institute of Deafness and other Communicative Disorders, National Institutes of Health Bethesda, Maryland 2002 BC Decker Hamilton • London Exit BC Decker Inc P.O. Box 620, L.C.D. 1 Hamilton, Ontario L8N 3K7 Tel: 905-522-7017; 800-568-7281 Fax: 905-522-7839; 888-311-4987 E-mail: