- Correspondence to Dr Christian Schyllert, Division of Occupational and Environmental Medicine, Department of Public Health and Clinical Medicine, Umeå University, Fogdevägen 3B, 371 40 Umeå 901 87, Sweden;
- Received January 28, 2016
- Revised June 20, 2016
- Accepted July 5, 2016
- First published July 27, 2016.
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