Villa, Oscar
Wohlfahrt, Johan C.
Koldsland, Odd Carsten
Brookes, Steven J.
Lyngstadaas, Staale P.
Aass, Anne M.
Reseland, Janne E.
Article History
Received: 21 December 2015
Accepted: 25 February 2016
First Online: 15 March 2016
Competing interests
: The authors declare no competing financial interests.