425POpioid-induced constipation in patients with cancer pain in Japan (OIC-J study): Patients' self-assessment of the symptoms and the impact. (25th November 2018) - Noriyuki, T; Imai, H; Fumita, S; Harada, T; Gamoh, M; Akashi, Y; Sato, H; Kizawa, Y; Tokoro, A