- Correspondence to Rikke Lund, Section of Social Medicine, Department of Public Health, University of Copenhagen, Oster Farimagsgade 5, Postbox 2099, DK-1014 Copenhagen K, Denmark;
- Received November 22, 2013
- Revised February 6, 2014
- Accepted March 10, 2014
- First published May 8, 2014.
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