Tørring, M L
Murchie, P
Hamilton, W
Vedsted, P
Esteva, M
Lautrup, M
Winget, M
Rubin, G
Article History
Received: 15 February 2017
Revised: 24 May 2017
Accepted: 29 June 2017
First Online: 8 August 2017
Competing interests
: The authors declare no conflict of interest.