Funding for this research was provided by:
Technische Universität München
Received: 24 January 2018
Accepted: 13 September 2018
First Online: 24 September 2018
Ethics approval and consent to participate
: Informed consent was obtained from all participants by completion of the questionnaire, how described in the Additional file InternalRef removed in the explanation of the survey for the patients. The questionnaire was approved by the Ethics Committee of the Technical University of Munich (TUM) with project number 412/14.
: Not applicable.
: The authors declare that they have no competing interest.
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