- Correspondence to Rogier M van Rijn, Department of Public Health, Erasmus MC, University Medical Center Rotterdam, Room Na-2202, P.O. Box 2040, Rotterdam 3000 CA, The Netherlands;
- Received May 6, 2013
- Revised September 30, 2013
- Accepted October 9, 2013
- First published October 29, 2013.
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