- 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 online 20 April 2013.
If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.