- Correspondence to Qi Wu, Mental Health and Addiction Research Group, Department of Health Sciences, Area 4, ARRC building, University of York, Heslington, York YO10 5DD, UK;
- Received 6 December 2013
- Accepted 20 May 2014
- Published in print 1 September 2015.
- Published online 20 August 2015.
- Published first 9 July 2014.
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