Institution: | 1.Department of Clinical Research, Faculty of Infectious and Tropical Diseases,London School of Hygiene and Tropical Medicine,London,UK;2.Disease Control and Elimination Theme, Medical Research Council Unit,Fajara,The Gambia;3.Kilimanjaro Christian Medical Centre,Moshi,Tanzania;4.International Centre for Eye Health,London School of Hygiene and Tropical Medicine,London,UK;5.Programa Nacional de Saude de Visao, Ministerio de Saude Publica,Bissau,Guinea-Bissau;6.Department of Immunology and Infectious Disease, Faculty of Infectious and Tropical Diseases,London School of Hygiene and Tropical Medicine,London,UK |