Mekelle University - Ayder Comprehensive Specialized Hospital, Mekelle University - Department of Paediatrics and Child Health, Mekelle University - School of Public Health, Mekelle University - Department of Biostatistics, Mekelle University - Department of Internal Medicine, Mekelle University - Department of Internal Medicine, Mekelle University - Department of Paediatrics and Child Health, Mekelle University - Department of Internal Medicine, Mekelle University - Department of Paediatrics and Child Health, Mekelle University - Department of Internal Medicine, Etiopia-Witten Development Aid Association and Etiopia-Witten Development Aid Association