The world's most widely used medical reference is now in its 20th edition. The Merck Manual of Diagnosis and Therapy now in its 20th edition has been thoroughly updated and thoughtfully expanded with a new larger trim size to include 40% new and revised content. Including 36 new chapters with more than 200 new tables, and numerous new figures. The world's most widely used medical reference is now in its 20th edition. The Merck Manual of Diagnosis and Therapy now in its 20th edition has been thoroughly updated and thoughtfully expanded with a new larger trim size to include 40% new and revised content. Including 36 new chapters with more than 200 new tables, and numerous new figures. The new Merck Manual of Diagnosis and Therapy 20th edition is a must-have for medical students, residents, practicing physicians, nurses, and allied health professionals. -- Provided by publisher.