1. Department of Paediatrics, Faculty of Clinical Sciences, College of Health Sciences, University of Jos, University of Jos Lamingo Campus, Jos 930232, Nigeria
2. Department of Paediatrics, Faculty of Clinical Services, College of Health Sciences, Bayero University, Aminu Kano Teaching Hospital Campus, Kano 700006, Nigeria
3. Department of Public Health, School of Population and Public Health, Faculty of Public Health, Texas Tech University Health Sciences Center, Lubbock, TX 79430, USA
4. Department of Paediatrics, Faculty of Clinical Sciences, College of Medical Sciences, Ahmadu Bello University, Main Campus, Zaria 810211, Nigeria
5. Department of Paediatrics, Obafemi Awolowo University Teaching Hospital, Ile-Ife 220005, Nigeria
6. Department of Pediatrics, Faculty of Medical School, School of Medicine, University of Minnesota, University of Minnesota Twin Cities Campus, Minneapolis, MN 55455, USA
7. Dr. John Archer Library and Archives, University of Regina, Regina, SK S4S 0A2, Canada
8. National Institute of Health, Bethesda, MD 20892, USA
9. Hennepin Healthcare, Minneapolis, MN 55415, USA