Risk factors for the onset of dependence and chronic psychosis due to cannabis use: Survey of patients with cannabis‐related psychiatric disorders by Toshihiko Matsumoto, Toshitaka Kawabata, Kyoji Okita, Yuko Tanibuchi, Daisuke Funada, Maki Murakami, Takashi Usami, Rie Yokoyama, Nobuya Naruse, Yuzo Aikawa, Aizo Furukawa, Chie Komatsuzaki, Nozomu Hashimoto, Osamu Fujita, Aiko Umemoto, Ariyuki Kagaya, Takuya Shimane

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