Kazumasa Fujitani, MDa, *, Prof Han-Kwang Yang, MDb, *, Junki Mizusawa, MSce, Young-Woo Kim, MDf, Masanori Terashima, MDg, Sang-Uk Han, MDh, Yoshiaki Iwasaki, MDi, Woo Jin Hyung, MDj, Akinori Takagane, MDk, Do Joong Park, MDb, Takaki Yoshikawa, MDl, Seokyung Hahn, PhDc, Kenichi Nakamura, MDe, Cho Hyun Park, MDm, Yukinori Kurokawa, MDn, Prof Yung-Jue Bang, MDd, Prof Byung Joo Park, MDc, Prof Mitsuru Sasako, MDo, Dr Toshimasa Tsujinaka, MDp, for the REGATTA study investigators†
a Department of Surgery, Osaka Prefectural General Medical Centre, Osaka, Japan
b Department of Surgery, Seoul National University College of Medicine, Seoul, South Korea
c Medical Research Collaborating Centre, Seoul National University College of Medicine, Seoul, South Korea
d Department of Internal Medicine, Seoul National University College of Medicine, Seoul, South Korea
e Japan Clinical Oncology Group Data Centre/Operations Office, National Cancer Centre, Tokyo, Japan
f Department of Surgery, National Cancer Centre, Seoul, South Korea
g Department of Gastric Surgery, Shizuoka Cancer Centre, Shizuoka, Japan
h Department of Surgery, Ajou University School of Medicine, Suwon, South Korea
i Department of Surgery, Tokyo Metropolitan Komagome Hospital, Tokyo, Japan
j Department of Surgery, Yonsei University College of Medicine, Seoul, South Korea
k Department of Surgery, Hakodate Goryokaku Hospital, Hakodate, Japan
l Department of Surgery, Kanagawa Cancer Centre, Yokohama, Japan
m Department of Surgery, The Catholic University of Korea, Seoul St Mary's Hospital, Seoul, South Korea
n Department of Gastrointestinal Surgery, Osaka University Graduate School of Medicine, Osaka, Japan
o Department of Surgery, Hyogo College of Medicine, Nishinomiya, Japan
p Department of Surgery, Kaizuka City Hospital, Osaka, Japan
Correspondence to: Dr Toshimasa Tsujinaka, Department of Surgery, Kaizuka City Hospital, Kaizuka, Osaka 597-0015, Japan
*Contributed equally
†Investigators listed in appendix