Funding for this research was provided by:
Bundesministerium für Gesundheit (ZMVI 1 2517ZPK726)
Received: 29 March 2019
Accepted: 10 June 2019
First Online: 14 June 2019
Ethics approval and consent to participate
: Participation in the survey was voluntary and anonymous.
: Not applicable
: The authors declare that they have no competing interests.