A direct effect of hyperinsulinemia on serum sex hormone-binding globulin levels in obese women with the polycystic ovary syndrome - Nestler, J E; Powers, L P; Matt, D W; Steingold, K A; Plymate, S R; Rittmaster, R S; Clore, J N; Blackard, W G (J Clin Endocrinol Metab, 1991)