Boston University School of Medicine, Boston, MA, USA. Electronic address: kaku@bu.edu. UCL Queen Square Institute of Neurology, University College London, London, UK; Institute of Infection and Global Health, University of Liverpool, Liverpool, UK. Duke Global Health Institute, Duke University, Durham, North Carolina, NC, USA. Northwestern University Feinberg School of Medicine, Chicago, IL, USA. University of California, San Francisco, CA, USA. Moi Teaching and Referral Hospital, Eldoret, Kenya. Vanderbilt University Medical Center, Nashville VA Medical Center, VA Tennessee Valley Healthcare System, Nashville, TN, USA.