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Increasing Incidence of Degenerative Spinal Diseases in Japan during 25 Years: The Registration System of Spinal Surgery in Tohoku University Spine SocietyAizawa, Toshimi; Kokubun, Shoichi; Ozawa, Hiroshi; Kusakabe, Takashi; Tanaka, Yasuhisa; Hoshikawa, Takeshi; Hashimoto, Ko; Kanno, Haruo; Morozumi, Naoki; Koizumi, Yutaka; Sato, Tetsuro; Hyodo, Hironori; Kasama, Fumio; Ogawa, Shinji; Murakami, Eiichi; Kawahara, Chikashi; Yahata, Jun-ichiro; Ishii, Yushin; Itoi, Eiji · The Tohoku Journal of Experimental Medicine · 2016