- Correspondence to Professor Peter Lange, Professor and Consultant in Respiratory Medicine, Department of Public Health, Section of Social Medicine, University of Copenhagen, Øster Farimagsgade 5, PO Box 2099, Copenhagen K DK-1015, Denmark;
- Received December 10, 2015
- Revised February 8, 2016
- Accepted February 23, 2016
- First published March 25, 2016.
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