- Correspondence to Dr Niels Kristian Kjaer, Research Unit of General Practice, Institute of Public Health, University of Southern Denmark, J.B. Winslows Vej 9A, 5000 c, Odense, Denmark;
- Received December 5, 2012
- Revised April 27, 2014
- Accepted May 1, 2014
- First published May 26, 2014.
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