- Correspondence to Dr Henk F van der Molen, Amsterdam UMC, University of Amsterdam, Department: Coronel Institute of Occupational Health, Netherlands Center for Occupational Diseases, Amsterdam Public Health research institute, Amsterdam 1100 DD, The Netherlands;
- Received July 26, 2018
- Revised September 11, 2018
- Accepted September 23, 2018
- First published October 8, 2018.
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