33. Factors Influencing the Results of Surgery for Ossification of the Posterior Longitudinal Ligament in the Thoracic Spine—A Multi-institutional Retrospective Study by Matsumoto, Morio, MD, Chiba, Kazuhiro, MD, Toyama, Yoshiaki, MD, Takeshita, Katsushi, MD, Seichi, Atsushi, MD, Nakamura, Kozo, MD, Arimizu, Jun, MD, Fujibayashi, Shunsuke, MD, Hirabayashi, Shigeru, MD, Hirano, Toru, MD, Iwasaki, Motoki, MD, Kaneoka, Kouji, MD, Kawaguchi, Yoshiharu, MD, Ijiri, Kosei, MD, Maeda, Takeshi, MD, Matsuyama, Yukihiro, MD, Mikami, Yasuo, MD, Murakami, Hideki, MD, Nagashima, Hideki, MD, Nagata, Kensei, MD, Nakahara, Shinnosuke, MD, Nohara, Yutaka, MD, Oka, Shiro, MD, Sakamoto, Keizo, MD, Saruhashi, Yasuo, MD, Sasao, Yutaka, MD, Shimizu, Katsuji, MD, Taguchi, Toshihiko, MD, Takahashi, Makoto, MD, Tanaka, Yasuhisa, MD, Tani, Toshikazu, MD, Tokuhashi, Yasuaki, MD, Uchida, Kenzo, MD, Yamamoto, Kengo, MD, Yamazaki, Masashi, MD, Yokoyama, Toru, MD, Yoshida, Munehito, MD, Nishiwaki, Yuji, MD

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