1. School of Public Health, College of Medicine and Health Sciences, Hawassa University, Hawassa P.O. Box 1560, Ethiopia
2. Department of Pharmacology and Clinical Pharmacy, College of Health Sciences, Addis Ababa University, Addis Ababa P.O. Box 9086, Ethiopia
3. Department of Pediatrics, College of Medicine and Health Sciences, Hawassa University, Hawassa P.O. Box 1560, Ethiopia
4. Center for Innovative Drug Development and Therapeutic Trials for Africa, College of Health Sciences, Addis Ababa University, Addis Ababa P.O. Box 9086, Ethiopia
5. Department of Global Public Health, Karolinska Institutet, Karolinska University Hospital, 171 77 Stockholm, Sweden