Received: 23 November 2018
Accepted: 28 May 2019
First Online: 6 June 2019
Ethics approval and consent to participate
: This study was approved by the Ethics Committee “Northwest/Central Switzerland” (Req_20217–00544), including the form of implied consent, given by answering and returning the questionnaire.
: Not applicable.
: The authors declare that they have no competing interests.