Changes in cross-sectional areas of posterior extensor muscles in thoracic spine: a 10-year longitudinal MRI study by Hitoshi Umezawa, Kenshi Daimon, Hirokazu Fujiwara, Yuji Nishiwaki, Takehiro Michikawa, Eijiro Okada, Kenya Nojiri, Masahiko Watanabe, Hiroyuki Katoh, Kentaro Shimizu, Hiroko Ishihama, Nobuyuki Fujita, Takashi Tsuji, Masaya Nakamura, Morio Matsumoto, Kota Watanabe

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