"Obstetrics and Gynecology has several sub-specialties, including reproductive endocrinology and infertility (REI) and maternal-fetal medicine."@en . . . . . . . "Obstetrics and Gynecology"@en . . . . "Obstetrics and Gynecology has several sub-specialties, including reproductive endocrinology and infertility (REI) and maternal-fetal medicine."@en . . . . . . . . . . . . . .