1 Departamento de Medicina Preventiva e Social, Faculdade de Medicina da Bahia, Universidade Federal da Bahia, Largo do Terreiro de Jesus, s/n. Centro Histórico, 40.026-010, Salvador, Bahia, Brazil.
2 Department of Public Health, Erasmus MC, University Medical Center Rotterdam, P.O. Box 20403000, CA, Rotterdam, The Netherlands.
3 Department of Public Health, Erasmus MC, University Medical Center Rotterdam, P.O. Box 20403000, CA, Rotterdam, The Netherlands. a.burdorf@erasmusmc.nl.