Article History
Received: 18 December 2019
Accepted: 30 January 2020
First Online: 15 February 2020
Compliance with ethical standards
:
: The authors declare no conflict of interest concerning the contents of this study.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institution or practice at which the studies were conducted. Cantonal Ethics Committee Zurich, No.: 2016-01228.
: Informed consent was obtained from all individual participants included in the study.