1. Department of International Public Health, Liverpool School of Tropical Medicine , Liverpool, L3 5QA , UK
2. Department of Haematology, Faculty of Basic Clinical Sciences, University of Maiduguri , Maiduguri, Borno State 60001 , Nigeria
3. Department of Medical Laboratory Science, Faculty of Allied Health Sciences, University of Maiduguri, Maiduguri, Borno State 60001 , Nigeria
4. Department of Haematology, Faculty of Basic Clinical Sciences, University of Maiduguri , Maiduguri, Borno, 60001 , Nigeria
5. Department of Clinical Infection, Microbiology and Immunology, Faculty of Health and Life Sciences, University of Liverpool , Liverpool , L69 3BX, UK
6. Department of Paediatrics, Faculty of Medicine, Kuwait University , Saffat 13110 , Kuwait