Received: 29 July 2019
Accepted: 11 March 2020
First Online: 19 March 2020
Ethics approval and consent to participate
: The study was approved by the Medical Ethics Committee of the Hamburg Medical Association, Germany (Ethic-Code PV5652). The ethical aspects were in full agreement with the Helsinki declaration.Prior to data collection, all respondents were informed about the aims of the study and data confidentiality, and gave written informed consent. All participants took part in the survey voluntarily.
: Not applicable.
: The authors declare that they have no competing interests.