The relative effect of endogenous estradiol and androgens on menopausal bone loss: a longitudinal study. - Guthrie JR; Lehert P; Dennerstein L; Burger HG; Ebeling PR; Wark JD (Osteoporosis international : a journal established as result of cooperation between the European Foundation for Osteoporosis and the National Osteoporosis Foundation of the USA, 2004)