Funding for this research was provided by:
Deutsche Gesellschaft für Krankenhaushygiene (Not appplicable)
Received: 25 January 2019
Accepted: 4 July 2019
First Online: 16 July 2019
Ethics approval and consent to participate
: Please see signed authors form, ethical approval was not needed for this paper.
: Not applicable.
: The authors declare that they have no competing interests.