1. Aggeu Magalhães Institute, FIOCRUZ/PE , Av. Professor Moraes Rego, s/n—Campus da UFPE, Cidade Universitária, Recife, PE 50.740-465, Brazil
2. Center for Medical Sciences, Federal University of Pernambuco , Av. da Engenharia, s/n, Bloco ‘D’, 1º Andar—Cidade Universitária, Recife, PE 50.740-600, Brazil
3. Medical Sciences College, University of Pernambuco , Av. Gov. Agamenon Magalhães—Santo Amaro, Recife, PE 50.100-010, Brazil
4. Center for Philosophy and Human Sciences, Federal University of Pernambuco , Av. Prof. Moraes Rego, 1235—Cidade Universitária, Recife, PE 50670-901, Brazil
5. Epidemiology and Public Health, Maternal and Neonatal Health Group, London School of Hygiene & Tropical Medicine , Keppel Street, London WC1E 7HT, UK
6. International Centre for Evidence in Disability, London School of Hygiene & Tropical Medicine , Keppel Street, London WC1E 7HT, UK