Funding for this research was provided by:
Deutsche Rentenversicherung Bayern Süd
Received: 12 December 2019
Accepted: 2 June 2020
First Online: 13 June 2020
Ethics approval and consent to participate
: The study was approved by the ethics committee of Bayerischen Landesärztekammer (No. 15017). All participants provided written informed consent.
: Not applicable.
: All authors declare no competing interests.