- Correspondence to Bettina Wulff Risør, Department of Public Health, Centre for Health Economics Research (COHERE), University of Southern Denmark, JB Winsløwsvej 9B, Odense C 5000, Denmark;
- Received July 11, 2015
- Revised September 9, 2015
- Accepted November 2, 2015
- First published November 27, 2015.
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