“Association BetweenMaternal Age at Pregnancy, Socioeconomic Status, Physical Environment, Prenatal, Perinatal, Postnatal History, and the Risk of Mental Retardation”. Journal of Maternal and Child Health 1, no. 2 (April 16, 2016): 119–130. Accessed February 1, 2026. https://thejmch.com/index.php/thejmch/article/view/20.