He used data from the National Center for Health Statistics' National Hospital Discharge Survey to determine that during 1989-2004, just under 12,900,000 adults underwent total colectomy, partial excision of the large intestine, cholecystectomy, appendectomy, vagotomy, gastrectomy, splenectomy, radical pancreaticoduodenectomy, exploratory laparotomy, or
abdominal perineal resection of the rectum.