Hengelbrock, Johannes
Höhle, Michael
Article History
Received: 23 October 2018
Revised: 26 April 2019
Accepted: 18 June 2019
First Online: 8 July 2019
Compliance with ethical standards
:
: Both authors declare that they have no conflict of interests.
: The data are collected and analysed as part of the routine quality assurance in Germany based on §136ff SGB V. Thus, no ethical approval of the study was necessary.