Received: 16 July 2019
Accepted: 16 January 2020
First Online: 7 February 2020
Ethics approval and consent to participate
: The study is based on claims data from the Allgemeine Ortskrankenkasse. Based on § 303e of the German Social Code Book V, the AOK Research Institute is commissioned and authorized to use these claims data for scientific purposes. Consequently, no particular ethical approval is needed.
: Not applicable.
: The authors declare that they have no competing interests.