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Endorphins and Pain ReliefAmano, Keiichi; Tanikawa, Tatsuya; Kawamura, Hirotsune; Iseki, Hiroshi; Notani, Masao; Kawabatake, Hiroko; Shiwaku, Tetsushi; Suda, Toshihiro; Demura, Hiroshi; Kitamura, Koiti · Stereotactic and Functional Neurosurgery · 1982