Bjørge, Tone
Gissler, Mika
Ording, Anne Gulbech
Engeland, Anders
Glimelius, Ingrid
Leinonen, Maarit
Sørensen, Henrik Toft
Tretli, Steinar
Ekbom, Anders
Troisi, Rebecca
Grotmol, Tom
Article History
Received: 1 May 2016
Revised: 19 August 2016
Accepted: 6 September 2016
First Online: 4 October 2016
Competing interests
: The authors declare no conflict of interest.