Liechti, Nicole
Schürch, Nadia
Bruggmann, Rémy
Wittwer, Matthias
Funding for this research was provided by:
Bundesbehörden der Schweizerischen Eidgenossenschaft
Article History
Received: 18 April 2018
Accepted: 3 August 2018
First Online: 5 September 2018
Ethics approval and consent to participate
: Not applicable
: Not applicable
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.