1 Neuroscience Unit, KEMRI-Wellcome Trust Research Programme, Kilifi 80108, Kenya; Department of Public Health, Pwani University, Kilifi, Kenya; Department of Psychiatry, University of Oxford, Oxford, UK. Electronic address: skariuki@kemri-wellcome.org.
2 Neuroscience Unit, KEMRI-Wellcome Trust Research Programme, Kilifi 80108, Kenya; Department of Public Health, Pwani University, Kilifi, Kenya; Department of Psychiatry, University of Oxford, Oxford, UK.