1 HIV Mental Health Research Unit, Division of Neuropsychiatry, Department of Psychiatry and Mental Health, Neuroscience Institute, University of Cape Town, Cape Town 7925, South Africa. Electronic address: sam.nightingale@uct.ac.za.
2 Unit of Infectious Diseases, San Raffaele Institute, Milan, Italy.
3 HIV Mental Health Research Unit, Division of Neuropsychiatry, Department of Psychiatry and Mental Health, Neuroscience Institute, University of Cape Town, Cape Town 7925, South Africa.
4 Department of Neurology, University of California San Francisco, San Francisco, CA, USA.
5 Division of Infection and Immunity, Cardiff University, Cardiff, UK.