Received: 16 June 2019
Accepted: 12 July 2019
First Online: 19 July 2019
Ethics approval and consent to participate
: The study was performed with the permission of the independent local ethics committee of the University of Ulm (approval 405/18). An written informed consent of all patients was obtained after explaining the purpose of the study. The right of participants to refuse or not to respond to questions if, they don’t feel comfortable with or discontinue participation at any time was ensured. Confidentiality was kept at each step of the data collection.
: Not applicable.
: The authors declare that they have no competing interests.