- 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 October 7, 2016
- Revised March 2, 2017
- Accepted March 19, 2017
- First published April 17, 2017.
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