Funding for this research was provided by:
Bundesministerium für Bildung und Forschung (01GY1611)
Text and Data Mining valid from 2019-07-07
Received: 21 January 2019
Accepted: 12 June 2019
First Online: 7 July 2019
Ethics approval and consent to participate
: This study was approved by the Ethics Committee of the Medical Faculty Heidelberg (S-516/2017. Participants consented to take part in the study by virtue of returning a questionnaire to us.
: Not applicable.
: The authors declare that they have no competing interests.