Knecht, Stefan http://orcid.org/0000-0001-9818-2372
Jensen, Hans Jørgen Aa. http://orcid.org/0000-0002-8743-7381
Saue, Trond http://orcid.org/0000-0001-6407-0305
Article History
Received: 13 April 2018
Accepted: 13 September 2018
First Online: 29 October 2018
Competing interests
: The Authors declare no competing interests.