Received: 10 June 2019
Accepted: 20 November 2019
First Online: 4 December 2019
Ethics approval and consent to participate
: According to national regulations ethics approval was not required because the study did not involve biomedical research and all data were anonymised. The Regional Committees for Medical and Health Research Ethics South East has been consulted and agreed with voluntary submission of the questionnaire as consent to participate in the study.
: Not applicable.
: The authors declare that they have no competing interests.