The premier reference on obstetrics practice for nearly a century, the new Twenty-Second Edition is the ideal text for anyone who provides maternal and fetal health care.Now offering state-of-the-art diagnostic ultrasound images throughout, Williams Obstetrics maintains its strong, evidence-based approach. Rigorously referenced and clearly written, Williams' hallmarks are thoroughness, scientific basis, and practical applicability for the obstetrician at the bedside. The world-renowned management guidelines and recommendations have been thoroughly updated through analysis of the scientific literature. This is the only book providing coverage sufficient for the needs of all practicing physicians and residents in board preparation and training.New features include: NEW STATE-OF-THE-ART ULTRASOUND IMAGES integrated throughout for easier diagnostic confirmation COMPLETELY REVISED BASIC SCIENCE SECTIONS for greater usefulness in daily practice NEW CHAPTERS on hot topics: prior cesarean delivery; gestational trophoblastic disease; obesity; thromboembolism; and liver disease THOROUGHLY UPDATED CHAPTERS on evolving areas: fetal development; placental disorders; and infectious diseases UPDATED GUIDELINES and STANDARDS of CARE reflecting the current scope of practice

F.加裏·坎寜根（F.Gary Cunningham），醫學博士，德剋薩斯大學西南醫學中心婦産科副教授，是《婦産科學》（Obstetrics and Gynecology）的第五任主席並任職22年。坎寜根博士是母嬰醫學學會（MFM Division，Maternal-Fetal Medicine Division）的成員，也是世界上公認的妊娠高血壓的權威專傢。