A phase II study of ramelteon for the prevention of postoperative delirium in elderly patients undergoing gastrectomy

Shinsaku Honda, Kenichiro Furukawa, Rie Makuuchi, Tomoyuki Irino, Masanori Tokunaga, Yutaka Tanizawa, Etsuro Bando, Taiichi Kawamura, Kaori Shinsato, Teruaki Matsumoto, Masanori Terashima