- Correspondence to Dr Ganna Kostygina, Senior Research Scientist, Health Media Collaboratory, NORC at the University of Chicago, 55 E Monroe Street, 3150L, Chicago, IL 60603, USA;
- Received March 31, 2016
- Revised July 14, 2016
- Accepted July 15, 2016
- First published October 3, 2016.
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