1. Department of Neurology, University of Michigan, Ann Arbor, MI 48105, USA
2. Department of Psychiatry, University College London, London, W1T 7BN, UK
3. Camden and Islington NHS Foundation Trust, London, NW1 OPE, UK
4. Department of Neurology, University of Rochester, Rochester, NY 14642, USA
5. Department of Internal Medicine, University of Zambia School of Medicine, Lusaka, 10101, Zambia
6. University Teaching Hospitals, Children's Hospital, Lusaka, 10101, Zambia
7. Zambart, School of Public Health, University of Zambia, Lusaka, 10101, Zambia
8. Department of Global Health and Development, Faculty of Public Health and Policy, London School of Hygiene and Tropical Medicine, London, WC1E 7HT, UK
9. Centre for Infectious Disease Research in Zambia, Lusaka, 10101, Zambia