1. Department of Social Medicine, Federal University of Pernambuco, Avenida Rui Barbosa, 716 - Flamengo, Rio de Janeiro, RJ, Brazil
2. Aggeu Magalhães Institute, FIOCRUZ/PE, Av. Professor Moraes Rego, s/n - Campus da UFPE, Cidade Universitária, Recife, PE, CEP:50.740-465, Brazil
3. Public Health Department, Faculty of Medicine, University of Pernambuco, Avenida Rui Barbosa, 716 - Flamengo, Rio de Janeiro, RJ, Brazil
4. Federal University of Pernambuco, Avenida Rui Barbosa, 716 - Flamengo, Rio de Janeiro, RJ, Brazil
5. Postgraduate Programme in Public Health, Federal University of Pernambuco, Avenida Rui Barbosa, 716 - Flamengo, Rio de Janeiro, RJ, Brazil
6. National Institute of Women, Children and Adolescents Health Fernandes Figueira/Fiocruz, Avenida Rui Barbosa, 716 - Flamengo, Rio de Janeiro, RJ, Brazil
7. Clinical Research Department, International Centre for Evidence in Disability, London School of Hygiene & Tropical Medicine, Kepple Street, London, UK
8. Epidemiology and Public Health, Maternal and Neonatal Health Group, London School of Hygiene & Tropical Medicine, Kepple Street, London, UK