Funding for this research was provided by:
German Federal Statistical Office (RIFOSS)
Text and Data Mining valid from 2019-08-27
Received: 11 April 2018
Accepted: 22 July 2019
First Online: 27 August 2019
Ethics approval and consent to participate
: All computations are based on aggregate data rather than individual data and were performed within a safe computer lab of the Scientific Institute of the AOK (WIdO), Berlin.
: Not applicable
: The authors declare that they have no competing interests.