Received: 2 October 2017
Accepted: 7 February 2018
First Online: 15 February 2018
Ethics approval and consent to participate
: All procedures performed in this study in regard to the human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards: the study protocol was reviewed and approved by the Ethics Committee of the Swiss Canton of Bern (Ref.: Basec-Nr. 2016-01502). Written informed consent was obtained from all individual participants included in the study.
: Written consent to publish was obtained from the participant shown in Fig. InternalRef removed.
: The authors declare that they have no competing interests.
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