Association of physical activity with reproductive hormones: the Penn Ovarian Aging Study.
Schmitz KH, Lin H, Sammel MD, Gracia CR, Nelson DB, Kapoor S, DeBlasis TL, Freeman EW. Association of physical activity with reproductive hormones: the Penn Ovarian Aging Study. Cancer Epidemiol Biomarkers Prev. 2007 Oct; 16(10):2042-7.