- Correspondence to Professor Per Gustavsson, Unit of Occupational Medicine, Karolinska Institutet, Solnavägen 4, 113 65, Stockholm, Sweden;
- Received 3 November 2016
- Revised 29 March 2017
- Accepted 9 April 2017
- Published in print 8 June 2017.
- Published first 19 May 2017.
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