- Correspondence to Professor Nicola Low, Institute of Social and Preventive Medicine, Finkenhubelweg 11, University of Bern, Bern, CH-3012, Switzerland;
- Received 6 November 2014
- Accepted 9 November 2014
- Published in print 1 May 2015.
- Published online 17 April 2015.
- Published first 16 December 2014.
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