Wang, D
Fløisand, Y
Myklebust, C V
Bürgler, S
Parente-Ribes, A
Hofgaard, P O
Bogen, B
Taskén, K
Tjønnfjord, G E
Schjesvold, F
Dalgaard, J
Tveita, A
Munthe, L A
Article History
Received: 14 June 2016
Revised: 3 February 2017
Accepted: 14 February 2017
First Online: 24 February 2017
Competing interests
: The authors declare no conflict of interest.