The new edition of Williams Obstetrics maintains its strong evidence-based approach and includes more than 4,000 new references, updated guidelines, and a new easy access format in a 2-color design. Rigorously referenced and cohesively written, the hallmarks of Williams Obstetrics are its thoroughness, scientific basis, and practical applicability for the obstetrician at the bedside. The book maintains its strong evidence based approach whereby management guidelines and recommendations are evaluated on analysis of the scientific literature. Keyed to the premier Obstetric text in the world, Williams Obstetrics 22nd edition Study Guide is the perfecr examination preparation tool for written board and recertification examinations. (synopsis)