1 Bandim Health Project, OPEN, University of Southern Denmark, Copenhagen, Denmark; Bandim Health Project, Bissau, Guinea-Bissau. Electronic address: afisker@health.sdu.dk.
2 Bandim Health Project, OPEN, University of Southern Denmark, Copenhagen, Denmark; Copenhagen Phase IV Unit, Center for Clinical Research and Prevention, Frederiksberg and Bispebjerg Hospital, Frederiksberg, Denmark.