- Correspondence to Dr Timo-Kolja Pförtner, Institute of Medical Sociology, Health Services Research and Rehabilitation Science (IMVR), Faculty of Human Sciences and Faculty of Medicine, University of Cologne, Cologne, Germany;
- Received November 28, 2018
- Revised August 21, 2019
- Accepted August 23, 2019
- First published September 12, 2019.
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