W Koizumi, T Akiya, A Sato, K Yamaguchi, T Sakuyama, N Nakayama, S Tanabe, K Higuchi, T Sasaki, T Sekikawa and The Tokyo Cooperative Oncology Group (TCOG GI Group)
Japanese Journal of Clinical Oncology 39 ( 11 ): 713 - 719 , 2009