Article History
Received: 15 March 2019
Accepted: 30 August 2019
First Online: 9 October 2019
Ethics approval and consent to participate
: The study was approved by the local Ethics Committee of the canton of Zurich (Ref. Nr. 2015-0417) and all patients gave written informed consent to participate.
: Patients provided written informed consent that pseudonymised data will be used for research purposes and the reporting of study findings.
: The authors declare that they have no competing interests.