- Correspondence to Professor Bente Mertz Nørgård, Center for Clinical Epidemiology, Odense University Hospital. Sdr. Boulevard 29, entrance 216, Odense C DK-5000, Denmark;
- Received December 7, 2015
- Revised January 18, 2016
- Accepted February 8, 2016
- First published February 26, 2016.
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