- Correspondence to Dr Zorana J Andersen, Department of Public Health, Center for Epidemiology and Screening, University of Copenhagen, Øster Farimagsgade 5, Copenhagen 1014, Denmark; .
- Received September 25, 2015
- Revised January 11, 2016
- Accepted January 20, 2016
- First published February 17, 2016.
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