- Correspondence to Professor Jens Peter Ellekilde Bonde, Department of Occupational and Environmental Medicine, Copenhagen University Hospital Bispebjerg, Bispebjerg Bakke 23, Copenhagen 3100, Denmark;
- Received June 4, 2014
- Revised June 23, 2014
- Accepted July 3, 2014
- First published July 21, 2014.
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