Walter Arthur Bastedo (1873 - 1952) was a Canadian gastroenterologist. He is eponymously associated with Bastedo sign (1909) of chronic appendicitis.
Aaron sign: referred pain felt in the epigastrium upon continuous firm pressure over McBurney's point, indicative of chronic appendicitis (1913) by Charles Dettie Aaron (1866-1951)
Emil Samuel Perman (1856 - 1946) was a Swedish general surgeon. Eponymsously associated with the Perman-Rovsing sign
Anthony Bassler (1874-1959) was an American gastroenterologist. In 1913 he described Bassler sign: compressing the appendix to assist in diagnosing chronic appendicitis.