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Article History

Received: 5 December 2018

First Online: 2 May 2019

Disclosure

: There are no conflicts of interests (e.g., employment, consultancies, stock ownership, honoraria, paid expert testimony, patent applications/registrations, or grants or other funding with regard to this study) for any of the authors.

: The study was approved by the ethics committee of the University of Heidelberg and was conducted in accordance with the Declaration of Helsinki. The study was deemed to be without risk, including only anonymised analysis of routinely collected data; consequently the ethics committee of the University of Heidelberg did not request approval for consent.