Behnan, J
Stangeland, B
Hosainey, S A M
Joel, M
Olsen, T K
Micci, F
Glover, J C
Isakson, P
Brinchmann, J E
Article History
Received: 2 March 2016
Revised: 15 April 2016
Accepted: 22 April 2016
First Online: 27 June 2016
Competing interests
: The authors declare no conflict of interest.