Description:Clinical epidemiology becaome the mainstream in the era of evidence-based healtg care. These authors all devoted themself to this field in their career. This book demonstrated the advantages and disavantages of methodologies used in clinical research, especillay in randomized controlled trials. Readers can approach modern clinical epidemiology without any complex mathematic formulas. I suggest that every physician or researcher who is intrested in this field should read this book.