Dr. Sheri Fink's new book is War Hospital: A True Story of Surgery and Survival. It's about a group of doctors who treated patients in Srebrenica, Bosnia, under the most extreme conditions. They treated thousands of patients, often without electricity, water or proper medicine. Fink, a physician and writer based in New York, works with the humanitarian organization International Medical Corps. She just returned from Iraq and has also worked in the Balkans, southern Africa and Central Asia.