Sex hormones and age : A cross-sectional study of testosterone and estradiol and their bioavailable fractions in community-dwelling menFERRINI, R. L; BARRETT-CONNOR, E.American journal of epidemiology. 1998, Vol 147, Num 8, pp 750-754, issn 0002-9262Article

Caffeine intake and endogenous sex steroid levels in postmenopausal women : The Rancho Bernardo studyFERRINI, R. L; BARRETT-CONNOR, E.American journal of epidemiology. 1996, Vol 144, Num 7, pp 642-644, issn 0002-9262Article