Primary infertility/secondary infertility; Infertility duration; Cause of infertility Male factors (oligospermia/asthenospermia/other male factors) Female factors (fallopian tube factor/polycystic ovary syndrome/endometriosis/other female factors) Unexplained infertility COH protocol Ultralong GnRH agonist; Short GnRH agonist; GnRH antagonist; Microsimulation cycle; Long GnRH agonist; Natural or other. This evidence concerns the gene GNRH1 and polycystic ovary syndrome.