Vitamin D levels and bone mineral density of middle-aged premenopausal female football and volleyball players in Japan: a cross-sectional study by Kimiko Sakamoto, Takayuki Miyamori, Yuki Someya, Masashi Nagao, Yoshihiko Ishihara, Yohei Kobayashi, Yu Shimasaki, Junko Imai, Takeshi Ono, Hiroshi Ikeda, Kohzo Tashima, Masafumi Yoshimura

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