- Correspondence to Henk F van der Molen, Coronel Institute of Occupational Health, Academic Medical Center, University of Amsterdam, Netherlands Center for Occupational Diseases, P.O. Box 22700, Amsterdam 1100 DE, The Netherlands;
- Received November 7, 2015
- Revised January 15, 2016
- Accepted January 20, 2016
- First published March 3, 2016.
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