Finnerup, N B
Jensen, M P
Norrbrink, C
Trok, K
Johannesen, I L
Jensen, T S
Werhagen, L
Article History
Received: 10 October 2015
Revised: 13 November 2015
Accepted: 6 December 2015
First Online: 1 March 2016
Competing interests
: The authors declare no conflict of interest.