Received: 18 January 2020
Accepted: 2 July 2020
First Online: 13 July 2020
Ethics approval and consent to participate
: Not applicable, as the manuscript does not contain any individual persons’ data. Furthermore, authors did not have any access to information about patients’ identity or other personal information. No administrative permissions were required to access and use the data/records described in our study.
: Not applicable.
: KG, U-SA und MK declare that they have no competing interests. COJ is contracted and payed by the Association of German Private Healthcare Insurance.