Pregnancy outcome in female with polycystic ovary syndrome comparing the effects of laparoscopic ovary drilling and clomiphene citrate stimulation in female pre-treated with metformin: a retrospective study - Ott, J; Kurz, C; Nouri, K; Wirth, S; Vytiska-Binstorfer, E; Huber, J C; Mayerhofer, K (Reprod Biol Endocrinol, 2010)