Michael NeffDallas, TexasMariam BanoubJulius BonelloPeoria, Illinois Late at night, nearly as exhausted with worry as the patient suffering severe abdominal pain before him, William Halsted made an executive decision. “Mother,” he pleaded, “you have an infected gallbladder and you need an operation.” After more reassurance, Mrs. Halsted, clutching her side, lay on the table and…