Received: 8 April 2020
Accepted: 23 July 2020
First Online: 4 August 2020
Ethics approval and consent to participate
: The study was approved by the Ethics Committees of the Carl von Ossietzky University Oldenburg (no. 2016–064), For an analysis of anonymized claims data no informed consent was required.
: Not applicable.
: The authors declare that they have no competing interests.