- 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 15 August 2012
- Revised 11 March 2013
- Accepted 22 March 2013
- Published in print 19 April 2013.
- Published online 20 April 2013.
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