Text and Data Mining valid from 2019-02-23
Received: 11 January 2019
Accepted: 18 February 2019
First Online: 23 February 2019
Compliance with ethical standards
: JH, MKA, AS and JB declare that they have no conflict of interest. SS receives funding from the German Federal Ministry of Education and Research (01EO1004 and 01EO1504).
: In Germany the use of claims data for scientific research is regulated by the Code of Social Law (SGB X). An ethical approval and informed consent are not required as this study used routinely collected anonymized data.
: The datasets analysed during the current study are not publicly available due to data protection regulations by the German Social Security Code (Sozialgesetzbuch (SGB) V).