- Correspondence to Dr S J Stocks, COEH, 4th Floor Ellen Wilkinson Building, Centre for Epidemiology, Institute of Population Health, University of Manchester, Oxford Rd, Manchester M13 9PT, UK;
- Received August 15, 2012
- Revised March 11, 2013
- Accepted March 22, 2013
- First published April 20, 2013.
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