Olsson, C E
Alsadius, D
Pettersson, N
Tucker, S L
Wilderäng, U
Johansson, K-A
Steineck, G
Article History
Received: 16 February 2015
Revised: 14 June 2015
Accepted: 26 June 2015
First Online: 4 August 2015
Competing interests
: The authors declare no conflict of interest.