1. From the Division of Human Nutrition and Epidemiology, Wageningen University, Wageningen, Netherlands; the African Medical and Research Foundation, Nairobi, Kenya; the Department of Gastroenterology, Nijmegen University Medical Centre, Nijmegen, Netherlands; the Ministry of Health, Kibwezi Rural Health Centre, Kibwezi, Kenya; and the Department of Medicine, Division of Hematology, University of L