- Correspondence to Daniel Kotz, Institute of General Practice (ifam), Addiction Research and Clinical Epidemiology Unit, Centre for Health and Society (chs), Heinrich-Heine-University Düsseldorf, Dusseldorf, Germany;
- Received December 9, 2019
- Revised March 11, 2020
- Accepted March 19, 2020
- First published April 16, 2020.
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