1 Research and Development Department, Goodmayes Hospital, North East London NHS Foundation Trust, Ilford, UK; Division of Psychiatry, University College London, London, UK. Electronic address: m.horowitz@ucl.ac.uk.
2 Centre for Evidence-Based Medicine Odense and Cochrane Denmark, Department of Clinical Research, University of Southern Denmark, Odense, Denmark; Open Patient data Exploratory Network, Odense University Hospital, Odense, Denmark.
3 Research and Development Department, Goodmayes Hospital, North East London NHS Foundation Trust, Ilford, UK; Division of Psychiatry, University College London, London, UK.