Identification of patients at high risk for recurrence in carcinoma of the ampulla of Vater: Analysis in 460 patients oleh Masato Narita, Etsuro Hatano, Koji Kitamura, Ken Fukumitsu, Hirohisa Kitagawa, Yuhei Hamaguchi, Takefumi Yazawa, Hiroaki Terajima, Kazuhiko Kitaguchi, Toshihiko Hata, the Kyoto University Hepato‐Biliary Pancreatic surgery Study Group (KUHBPS)