1711POpioid-induced constipation in patients with cancer pain in Japan: Prospective observational study using Rome IV OIC diagnostic criteria (OIC-J Study). (23rd October 2018) - Imai, H; Fumita, S; Harada, T; Noriyuki, T; Gamoh, M; Akashi, Y; Sato, H; Kizawa, Y; Tokoro, A