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Secular trends in age at menarche and time to establish regular menstrual cycling in Japanese women born between 1930 and 1985

Michie Hosokawa*, Setsuko Imazeki, Hideki Mizunuma, Toshiro Kubota and Kunihiko Hayashi

BMC Women's Health 2012, 12:19  doi:10.1186/1472-6874-12-19

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