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Article History

Received: 30 November 2017

Accepted: 6 February 2018

First Online: 13 February 2018

Ethics approval and consent to participate

: Informed consent was given by each participant. Data collection and study procedure was approved by the corporate data protection officer and by the Ethical Committee of the Bavarian State Chamber of Physicians in Munich.

: Not applicable

: The authors declare that they have no competing interests.

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