PRL and Insulin resistance: FSH: follicular stimulating hormone, LH: luteinizing hormone, PRL: prolactin, E2: 17-b estradiol, 17OH-P: 17OH-progesterone, DHEAS: dehydroepiandrosterone sulphate, SHBG: sex hormone binding globulin, TSH: thyroid-stimulating hormone, HDL: high-density lipoproteins, LDL: low-density lipoproteins, TG: triglycerides, Lpa: lipoprotein (a), APO: apolipoprotein, HOMA-IR: Homeostasis Model Assessment for Insulin Resistance, QUICKI: Quantitative Insulin Sensitivity Check Index