1. Department of Neurology, University of Michigan , Ann Arbor, 48109 Michigan, USA
2. Maryland Global Initiatives Corporation (MGIC) , Lusaka, Zambia
3. University of Lusaka , 10101 Lusaka, Zambia
4. Department of Neurology, University of Rochester , Rochester, 14642 New York, USA
5. University Teaching Hospitals Children's Hospital , 10101 Lusaka, Zambia
6. Department of Internal Medicine, University of Zambia, School of Medicine , 10101 Lusaka, Zambia
7. Centre for Infectious Disease Research in Zambia , 10101 Lusaka, Zambia
8. Department of Neurology, Johns Hopkins University School of Medicine , Baltimore, Maryland, USA
9. Department of International Health, Johns Hopkins Bloomberg School of Public Health , Baltimore, 21205 Maryland, USA