- Correspondence to Dr Evangelos Kontopantelis, Institute of Population Health, University of Manchester, 5th Floor, Williamson Building, Manchester M13 9PL, UK;
- Received July 14, 2015
- Revised October 20, 2015
- Accepted November 1, 2015
- First published December 1, 2015.
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- Data supplement 1 - Online appendix
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