Stephensen, Hans Jacob Teglbjærg http://orcid.org/0000-0001-8245-0571
Darkner, Sune
Sporring, Jon http://orcid.org/0000-0003-1261-6702
Article History
Received: 30 September 2019
Accepted: 24 January 2020
First Online: 21 February 2020
Competing interests
: The authors declare no competing interests.