- Correspondence to Dr Anna Mölter, Centre for Occupational & Environmental Health, Centre for Epidemiology, Institute of Population Health, Manchester Academic Health Sciences Centre, Room C4.19 Ellen Wilkinson Building, Oxford Road, Manchester M13 9PL, UK;
- Received March 27, 2013
- Revised July 29, 2013
- Accepted July 30, 2013
- First published September 2, 2013.
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