Efficacy of postoperative adjuvant chemotherapy using S-1 in elderly patients with resectable pancreatic cancer. (2019) - Hijikata, Yosuke; Nagakawa, Yuichi; Sahara, Yatsuka; Takishita, Chie; Osakabe, Hiroaki; Masanori, Akashi; Nishino, Hitoe; Katsumata, Kenji; Tsuchida, Akihiko