Text and Data Mining valid from 2019-08-30
Received: 25 March 2019
Accepted: 17 August 2019
First Online: 30 August 2019
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: All procedures performed in this study involving human participants were in accordance with the ethical standards of the Ethics Committee of the Swiss Canton of Bern (Ref. 2017-01894) and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. Full ethical approval was obtained.
: Informed consent was obtained from all individual participants included in the study.
: Written informed consent for publication was obtained from the individual depicted in the image in Fig. InternalRef removed.