Received: 2 November 2018
Accepted: 1 November 2019
First Online: 9 December 2019
Ethics approval and consent to participate
: the Ethics Commission of the Canton of Bern approved this pilot study (KEK-2016/00320). A registration was made on the registration platform ClinicalTrial.gov (NCT02832141).
: not applicable.
: The authors declare no potential conflict of interest with respect to the authorship and/or publication of this article.