Guggenheim, Carole
Brand, Andreas
Bürgmann, Helmut http://orcid.org/0000-0002-5651-5906
Sigg, Laura
Wehrli, Bernhard
Article History
Received: 5 December 2017
Accepted: 19 February 2019
First Online: 18 March 2019
Competing Interests
: The authors declare no competing interests.