High prevalence of severe pain is associated with low opioid availability in patients with advanced cancer: Combined database study and nationwide questionnaire survey in Japan by Maiko Hasegawa‐Moriyama, Yasuhide Morioka, Shinzo Hiroi, Noriyuki Naya, Yura Suzuki, Yuichi Koretaka, Erina Hara, Hiroaki Abe, Kanji Uchida, Masahiko Sumitani

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