- Correspondence to Professor Nicola Low, Department of Epidemiology and Public Health, Institute of Social and Preventive Medicine, University of Bern, Finkenhubelweg 11, CH-3012, Switzerland;
- Accepted 11 May 2012
- Published in print 1 January 2012.
- Published online 24 July 2012.
- Published first 6 July 2012.
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