Clinical Features Required for Pancreatoduodenectomy for Noniatrogenic Duodenal Perforation. Issue 5 (May 2020) - Yokozuka, Kei; Chiba, Naokazu; Koganezawa, Itsuki; Nakagawa, Masashi; Ozawa, Yosuke; Kobayashi, Toshimichi; Sano, Toru; Tomita, Koichi; Tsutsui, Rina; Kawachi, Shigeyuki