Received: 26 October 2019
Accepted: 17 March 2020
First Online: 30 March 2020
Ethics approval and consent to participate
: This survey was approved by the ethics committee of the Medical faculty of Marburg University (Approval number: 18/12). According to the decision of the local ethics committee, no written consent for participation was required.
: Not applicable.
: The authors declare that they have no competing interests.