Haller, Elisa
Watzke, Birgit
Blozik, Eva
Rosemann, Thomas
Reich, Oliver
Huber, Carola A.
Wolf, Markus
Article History
Received: 25 September 2018
Accepted: 11 June 2019
First Online: 24 June 2019
Ethics approval and consent to participate
: All data were retrospective, pre-existing, de-identified and anonymized in compliance with Swiss regulations on privacy Law. Since the data used were retrospective, de-identified and anonymized health-related data prior to analysis, this study is not subject to the Swiss Federal Law on human research (Humanforschungsgesetz) [CitationRef removed] and was thus exempted from the local ethics committee approval (ethical committee of the Canton Zurich) and from seeking informed consent of patients.
: Not applicable.
: CAH and EB are affiliated with the department of health sciences of the Helsana Insurance Group. Helsana provided the administrative data. On behalf of all other authors, the corresponding author declares that there is no conflict of interests.