Laparoscopic versus open pancreaticoduodenectomy for ampullary cancer: A retrospective study. - Sakuma, Masayoshi; Maeda, Atsuyuki; Takayama, Yuichi; Takahashi, Takamasa; Aoyama, Hiroki; Takahashi, Daigoro; Hosoi, Takahiro (Asian Journal of Endoscopic Surgery, 2024)