- Correspondence to Rogier M van Rijn, Department of Public Health, Erasmus MC, University Medical Center Rotterdam, Room NA2219, P.O. Box 2040, Rotterdam 3000 CA, The Netherlands;
- Received June 15, 2015
- Revised November 20, 2015
- Accepted November 30, 2015
- First published January 6, 2016.
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