Comparison of laminoplasty and posterior fusion surgery for cervical ossification of posterior longitudinal ligament oleh Hiroaki Nakashima, Shiro Imagama, Toshitaka Yoshii, Satoru Egawa, Kenichiro Sakai, Kazuo Kusano, Yukihiro Nakagawa, Takashi Hirai, Kanichiro Wada, Keiichi Katsumi, Kengo Fujii, Atsushi Kimura, Takeo Furuya, Tsukasa Kanchiku, Yukitaka Nagamoto, Yasushi Oshima, Narihito Nagoshi, Kei Ando, Masahiko Takahata, Kanji Mori, Hideaki Nakajima, Kazuma Murata, Shunji Matsunaga, Takashi Kaito, Kei Yamada, Sho Kobayashi, Satoshi Kato, Tetsuro Ohba, Satoshi Inami, Shunsuke Fujibayashi, Hiroyuki Katoh, Haruo Kanno, Yuanying Li, Hiroshi Yatsuya, Masao Koda, Yoshiharu Kawaguchi, Katsushi Takeshita, Morio Matsumoto, Masashi Yamazaki, Atsushi Okawa, Japanese Multicenter Research Organization for Ossification of the Spinal Ligament