1. Clinical and Experimental Sciences, Faculty of Medicine, University of Southampton, Southampton, UK
2. National Institute for Health and Care Research (NIHR) Applied Research Collaboration Wessex, Southampton, UK
3. School of Health Sciences, University of Southampton, Southampton, UK
4. University Department of Psychiatry and Mental Health, University of Cape Town, Cape Town, South Africa
5. Mood Disorders Service, Southern Health NHS Foundation Trust, Southampton, UK