1. International Centre for Evidence in Disability, London School of Hygiene & Tropical Medicine, London, UK
2. Department of Hearing and Speech Sciences, Multidisciplinary Institute of Rehabilitation and Health, Federal University of Bahia, Salvador, Brazil
3. Instituto de Medicina Fisica e Reabilitacao, Hospital das Clinicas HCFMUSP, Faculdade de Medicina, Universidade de Sao Paulo, Sao Paulo, SP, Brazil
4. Epidemiology and Public Health, Maternal and Neonatal Health Group, London School of Hygiene & Tropical Medicine, London, UK