A region-based palliative care intervention trial using the mixed-method approach: Japan OPTIM study

Tatsuya Morita, Mitsunori Miyashita, Akemi Yamagishi, Nobuya Akizuki, Yoshiyuki Kizawa, Yutaka Shirahige, Miki Akiyama, Kei Hirai, Motohiro Matoba, Masako Yamada, Taketoshi Matsumoto, Takuhiro Yamaguchi, Kenji Eguchi