*2.4. Compliance with Ethical Standards*

Study participation was voluntary, free of any compensation and individual verbal and written patient consent was obtained before answering the survey. Patient-related information was anonymized prior to analysis. The study was presented to and approved by the regional ethics committee of the Canton of Bern, Switzerland (06.10.2016, KEK-BE: 2016-01662). The study—including data collection and extraction, anonymization, analysis, and storage—was performed in accordance with Swiss law, the standards of the local ethics committee and the Declaration of Helsinki [23].
