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Article History

Received: 29 June 2018

Accepted: 31 January 2019

First Online: 1 March 2019

Ethics approval and consent to participate

: The study was approved by the responsible ethics committee of the Technische Universität Dresden (EK 67022014) and the Saxon Data Protection Commissioner (2–7410-74/1). The study was performed in accordance with the declaration of Helsinki. Since the study used health insurance data, no individual consent of participation was required.

: Not applicable.

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