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Article History

Received: 28 July 2018

Accepted: 7 November 2018

First Online: 7 January 2019

Ethics approval and consent to participate

: This research has been approved by the data protection office at the Charité – Universitätsmedizin Berlin on the 9th of June, 2017 and by the ethics committee at the Charité – Universitätsmedizin Berlin on the 21st of September 2017. Anonymity was assured; a consent form was signed by participants who also provided basic demographic data.

: This is not applicable here.

: The authors declare that they have no competing interests.

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