Leppänen, M H
Nyström, C Delisle
Henriksson, P
Pomeroy, J
Ruiz, J R
Ortega, F B
Cadenas-Sánchez, C
Löf, M
Article History
Received: 23 October 2015
Revised: 23 February 2016
Accepted: 28 February 2016
First Online: 18 April 2016
Competing interests
: The authors declare no conflict of interest.