- Correspondence to Professor Holger Dressel, Division of Occupational and Environmental Medicine, EBPI, University of Zurich and University Hospital Zurich, Hirschengraben 84, Zurich 8001, Switzerland;
- Received 7 October 2016
- Revised 2 March 2017
- Accepted 19 March 2017
- Published online 17 April 2017.
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