Calais-Ferreira L, Mendonça E, Barreto ME, Dite GM, Hickey M, Ferreira PH, et al. Sex Differences in Infant Mortality: A Population Data Linkage Study of Brazilian Male-Female Twin Pairs. IJPDS [Internet]. 2020 Dec. 7 [cited 2026 Oct. 27];5(5). Available from: https://ijpds.org/index.php/ijpds/article/view/1578