Age, body mass index, race, and other determinants of steroid hormone variability: the heritage family study. - Ukkola,O.; Gagnon,J.; Rankinen,T.; Thompson,P.A.; Hong,Y.; Leon,A.S.; Rao,D.C.; Skinner,J.S.; Wilmore,J.H.; Bouchard,C. (Eur J Endocrinol, 2001)