- 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 14 March 2017
- Revised 2 June 2017
- Accepted 28 June 2017
- Published online 5 August 2017.
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