Stillhard, A.
Cazzaniga, S.
Borradori, L.
Beltraminelli, Helmut http://orcid.org/0000-0002-8179-1793
Article History
Received: 11 July 2018
Revised: 21 November 2018
Accepted: 7 December 2018
First Online: 13 December 2018
Compliance with ethical standards
:
: Reviewed and approved by the ethics committee of the Canton of Bern, Switzerland (KEK-229/14).
: The authors declare that they have no conflict of interest.