1. Serviço de Epidemiologia, Ministério de Saúde Pública, Bissau, Guine‐Bissau
2. Public Health and Clinical Medicine, Umeå University, Umeå, Sweden
3. Projecto de Saúde de Bandim, Ministério de Saúde Pública, Bissau, Guine‐Bissau
4. Centre for International Health, University of Bergen, Norway
5. Epidemiology Research Unit, Danish Epidemiology Science Centre, Statens Seruminstitut, Copenhagen, Denmark