- Correspondence to Florian M Karl, Institute of Health Economics and Healthcare Management, Helmholtz Zentrum München (GmbH) – German Research Center for Environmental Health, Ingolstädter Landstraße 1, 85764 Neuherberg, Germany;
- Received March 14, 2017
- Revised June 2, 2017
- Accepted June 28, 2017
- First published August 5, 2017.
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