1 Health Equity Action Lab, Department of Infectious Disease Epidemiology & International Health, London School of Hygiene & Tropical Medicine, London, UK.
2 Departamento de Medicina Interna, Universidade de Pernambuco, Recife 50100-130, Brazil.
3 Departamento de Medicina Interna, Universidade de Pernambuco, Recife 50100-130, Brazil; Departamento de Medicina Tropical, Universidade Federal de Pernambuco, Recife, Brazil. Electronic address: raaximenes@uol.com.br.