1 Department of Psychiatry, University of Cambridge, Cambridge Biomedical Campus, Cambridge CB2 0SZ, UK. Electronic address: tjf52@medschl.cam.ac.uk.
2 Department of Psychiatry, University of Cambridge, Cambridge Biomedical Campus, Cambridge CB2 0SZ, UK; Komfo Anokye Teaching Hospital, Kumasi, Ghana; Behavioural Sciences Department, School of Medicine and Dentistry, Kwame Nkrumah University of Science and Technology, PMB, Kumasi, Ghana.
3 University of Exeter Medical School, Exeter, UK.
4 Faculty of Education, University of Cambridge, Cambridge, UK.
5 Department of Paediatrics, University of Cambridge, Cambridge Biomedical Campus, Cambridge, UK.