1. Faculty of Epidemiology & Population Health London School of Hygiene & Tropical Medicine London UK
2. Institute of Neurology, University College London London UK
3. Department of Infection, Immunity and Inflammation UCL Great Ormond Street Institute of Child Health, University College London London UK
4. Infectious Diseases Section, Department of Medicine, Michael E. DeBakey VAMC Baylor College of Medicine Houston Texas USA
5. Department of Internal Medicine Yale School of Medicine New Haven Connecticut USA
6. VA Connecticut Healthcare System, Department of Veterans Affairs West Haven Connecticut USA