Classic PCOS phenotype is not associated with deficiency of endogenous vitamin D and VDR gene polymorphisms rs731236 (TaqI), rs7975232 (ApaI), rs1544410 (BsmI), rs10735810 (FokI): a case-control study of lower Silesian women - Jedrzejuk, D; Łaczmański, Ł; Milewicz, A (Gynecol Endocrinol, 2015)