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Progression of Cervical Spine Instabilities in Rheumatoid ArthritisYurube, Takashi; Sumi, Masatoshi; Nishida, Kotaro; Takabatake, Masato; Kohyama, Kozo; Matsubara, Tsukasa; Ozaki, Takuma; Maeno, Koichiro; Kakutani, Kenichiro; Zhang, Zhongying; Doita, Minoru · Spine · 2011