- Correspondence to Dr Jens Sundbøll, Department of Clinical Epidemiology, Aarhus University Hospital, Olof Palmes Allé 43-45, Aarhus N DK-8200, Denmark;
- Received July 4, 2014
- Revised August 15, 2014
- Accepted August 18, 2014
- First published September 10, 2014.
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