Selection of opioids for cancer-related pain using a biomarker: a randomized, multi-institutional, open-label trial (RELIEF study) by Hiromichi Matsuoka, Junji Tsurutani, Yasutaka Chiba, Yoshihiko Fujita, Masato Terashima, Takeshi Yoshida, Kiyohiro Sakai, Yoichi Otake, Atsuko Koyama, Kazuto Nishio, Kazuhiko Nakagawa

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