1 International Center for Equity in Health, Federal University of Pelotas, Pelotas, Brazil. Electronic address: abarros@equidade.org.
2 International Center for Equity in Health, Federal University of Pelotas, Pelotas, Brazil.
3 Royal Tropical Institute, Amsterdam, Netherlands.
4 School of Public Health, University of Adelaide, Adelaide, SA, Australia; School of Social and Community Medicine, University of Bristol, Bristol, UK.