Association between low back pain and limited lower-extremity flexibility in elementary school-aged softball players: a cross-sectional study by Suzuno Endo, Kinshi Kato, Kenichi Otoshi, Yota Kaneko, Ryoji Tominaga, Takahiro Kaga, Takahiro Igari, Ryohei Sato, Kenji Kobayashi, Shin-ichi Konno, Yoshihiro Matsumoto

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