Müller, Beat http://orcid.org/0000-0003-3696-9035
Steinsberger, Thomas http://orcid.org/0000-0002-0751-5424
Schwefel, Robert http://orcid.org/0000-0003-1610-4181
Gächter, René http://orcid.org/0000-0002-7186-8574
Sturm, Michael http://orcid.org/0000-0003-2414-7894
Wüest, Alfred http://orcid.org/0000-0001-7984-0368
Article History
Received: 15 September 2019
Accepted: 12 November 2019
First Online: 2 December 2019
Competing interests
: The authors declare no competing interests.