Factor analysis for construct validity of a trunk impairment scale in Parkinson’s disease: a cross-sectional study by Kazunori Sato, Yuta Yamazaki, Yoshihiro Kameyama, Koji Watanabe, Eriko Kitahara, Koshiro Haruyama, Yoko Takahashi, Yuji Fujino, Tomofumi Yamaguchi, Tadamitsu Matsuda, Hitoshi Makabe, Reina Isayama, Yuhei Murakami, Mami Tani, Kaoru Honaga, Kozo Hatori, Yutaka Oji, Yuji Tomizawa, Taku Hatano, Nobutaka Hattori, Toshiyuki Fujiwara, Toshiyuki Fujiwara

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