Jakobsen, Lotte K
Trelborg, Karina F
Simonsen, Ulf
Andersson, Karl-Erik
Olsen, L H
Article History
Received: 29 December 2016
Revised: 3 May 2017
Accepted: 18 July 2017
First Online: 4 October 2017
Competing interests
: The authors declare no conflict of interest.