1. Bandim Health Project, Indepth Network, Apartado 861, Bissau 1004, Guinea-Bissau
2. Institute of Health, Aarhus University, Nordre Ringgade 1, Aarhus C 8000, Denmark
3. Research Center for Vitamins and Vaccines, Statens Serum Institut, Artillerivej 5, Copenhagen S 2300, Denmark
4. OPEN, Department of Clinical Research, University of Southern Denmark, and Odense University Hospital, J.B. Winsløws Vej 9A, Odense C 5000, Denmark
5. Department of Pathology and Laboratory Medicine, University of British Columbia, Rm. G227–2211 Wesbrook Mall, Vancouver, BC Canada V6T 2B5
6. Department of Pediatrics, University of British Columbia, Rm 2D19, 4480 Oak Street, Vancouver, BC Canada V6H 3V4
7. Department of Experimental Medicine, University of British Columbia, 2775 Laurel Street, Vancouver, BC Canada V5Z 1M9