Department of Nutrition, Exercise and Sports, University of Copenhagen, Rolighedsvej 30, 1958 Frederiksberg C, Denmark mette.frahm.olsen@gmail.com. Department of Laboratory Sciences and Pathology, Jimma University, Jimma, Ethiopia. Department of Nutrition, Exercise and Sports, University of Copenhagen, Rolighedsvej 30, 1958 Frederiksberg C, Denmark. Department of Psychiatry, College of Public Health and Medical Sciences, Jimma University, Jimma, Ethiopia. Department of Internal Medicine, Jimma University Specialized Hospital, Jimma, Ethiopia. Department of Paediatric and Child Health, Jimma University Specialized Hospital, Jimma, Ethiopia. Childhood Nutrition Research Centre, UCL Institute of Child Health, London, UK. Ethiopian Health and Nutrition Research Institute, Addis Ababa, Ethiopia. MRC Epidemiology Unit, University of Cambridge, Cambridge, UK. Department of Infectious Diseases, Odense University Hospital, Odense, Denmark.