Additional file 1: of Yokukansan for perioperative psychiatric symptoms in cancer patients undergoing high invasive surgery. J-SUPPORT 1605 (ProD Study): study protocol for a randomized controlled trial WadaSaho SadahiroRyoichi MatsuokaYutaka UchitomiYosuke YamaguchiTakuhiro ShimizuKen 2019 SPIRIT 2013 checklist: recommended items to address in a clinical trial protocol and related documents. (DOC 124 kb)