Dr. Tsai-Fan Yu, a physician and researcher at Mount Sinai Medical Center who helped explain a principal cause of gout and evaluated early drugs to treat the disease that are still in use, died earlier this month in Manhattan. She was 95: Tsai-Fan Yu, 95, Physician, Dies; Helped Alleviate Gout. Gout sucks. But now it sucks less, thanks to the work of Dr. Yu.