Palibrk, Vuk
Suganthan, Rajikala
Scheffler, Katja
Wang, Wei
Bjørås, Magnar
Bøe, Stig Ove
Article History
Received: 26 May 2016
Revised: 18 June 2016
Accepted: 24 June 2016
First Online: 28 July 2016
Competing interests
: The authors declare no conflict of interest.