Harrison's Principles of Internal Medicine is a widely used and respected textbook of medicine. The first edition was published in 1949 and the book has since undergone many revisions and updates, with the most recent edition being the 20th edition, published in 2018. The book covers a wide range of topics related to internal medicine, including cardiology, gastroenterology, hematology, oncology, nephrology, neurology, pulmonology, and rheumatology. The content is written by experts in the field and is designed to provide comprehensive coverage of the latest advances in diagnosis, treatment, and research. About the Author The Harrison's Principles of Internal Medicine textbook was originally authored by Dr. Tinsley R. Harrison , a renowned physician and educator who served as Chair of the Department of Medicine at the University of Alabama at Birmingham. Dr. Harrison began writing the firs...