Received: 12 August 2019
Accepted: 13 April 2020
First Online: 23 April 2020
Ethics approval and consent to participate
: The ethic committee of the Medical Faculty of the University of Regensburg approved this study (16–101-0247). Written consent was obtained from all study participants in accordance with the ethics approval. Participants received no incentive and participated voluntarily.
: Not applicable.
: The authors declare that they have no competing interests.