Funding for this research was provided by:
Robert Koch Institut (grant no. 1369-402)
Received: 5 October 2019
Accepted: 17 December 2019
First Online: 30 December 2019
Ethics approval and consent to participate
: The study was performed in accordance with the recommendations for surveillance and cluster detections of nosocomial infections of the legally assigned institute for infection control and prevention (Robert Koch Institute). Formal consent was therefore not required.
: Not applicable.
: The authors declare that they have no competing interests.