Text and Data Mining valid from 2020-04-10
Received: 6 November 2019
Accepted: 28 March 2020
First Online: 10 April 2020
Ethics approval and consent to participate
: This study solely relies on publically available secondary data (aggregated claims data [CitationRef removed]). Therefore, consent to participate is not required. The Ethics Board of the University Hospital Duesseldorf has confirmed that in case of published data, no review of the Ethics Board is necessary.
: Not necessary because this manuscript does not contain data from any individual person.
: The authors declare that they have no competing interests.