Serum visfatin in relation to insulin resistance and markers of hyperandrogenism in lean and obese women with polycystic ovary syndrome - Kowalska, I; Straczkowski, M; Nikolajuk, A; Adamska, A; Karczewska-Kupczewska, M; Otziomek, E; Wolczynski, S; Gorska, M (Hum Reprod, 2007)