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Calais-Ferreira, Lucas, Barreto, Marcos ORCID: 0000-0002-7818-1855, Mendonça, Everton, Dite, Gillian S, Hickey, Martha, Ferreira, Paulo H, Scurrah, Katrina J and L Hopper, John (2022) Birthweight, gestational age and familial confounding in sex differences in infant mortality: a matched co-twin control study of Brazilian male-female twin pairs identified by population data linkage. International Journal of Epidemiology, 51 (5). 1502 - 1510. ISSN 0300-5771