Effect of Programmed Endoscopic Follow-up Examinations on the Rebleeding Rate of Gastric or Duodenal Peptic Ulcers Treated by Injection Therapy: A Prospective, Randomized Controlled Trial - Messmann, H; Schaller, P; Andus, T; Lock, G; Vogt, W; Gross, V; Zirngibl, H; Wiedmann, K -H; Lingenfelser, T; Bauch, K; Leser, H G; Schölmerich, J; Holstege, A (Endoscopy, 1998)