Use of the Billroth I as a secondary procedure.
D004386:Duodenum / Q000601:surgery*; D005763:Gastroenterostomy; D006801:Humans; D007583:Jejunum; D010437:Peptic Ulcer / Q000601:surgery*; D013270:Stomach / Q000601:surgery*; D014456:Ulcer
DUODENUM/surgery; JEJUNUM/ulcers; PEPTIC ULCER/surgery; STOMACH/surgery