- Correspondence to Kayvan Bozorgmehr, Department of General Practice & Health Services Research, University Hospital Heidelberg, Heidelberg, Marsilius Arkaden, Turm West, 69120 Heidelberg, Germany;
- Received 10 October 2016
- Revised 17 April 2017
- Accepted 5 May 2017
- Published online 14 July 2017.
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