- Correspondence to Professor Nir Eyal, Department of Global Health and Population, Harvard T. H. Chan School of Public Health, FXB Building, 7th floor, 651 Huntington Ave., Boston, MA 02115, USA;
- Received November 14, 2015
- Revised January 28, 2017
- Accepted March 6, 2017
- First published April 10, 2017.
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