Male-female pairs would be the only form of twin few discordant for sex and therefore are once the popular due to the fact same-sex dizygotic sets
Lucas Calais-Ferreira, Marcos Age Barreto, Everton Mendonca, Gillian S Dite, Martha Hickey, Paulo H Ferreira, Katrina J Scurrah, John L Hopper, Birthweight, gestational ages and you will familial confounding in the sex differences in newborn mortality: a matched co-dual control study of Brazilian men-women dual sets recognized by population research linkage, In the world Diary regarding Epidemiology, Regularity 51, Material 5, , Profiles 1502–1510,