Alehagen, U
Johansson, P
Björnstedt, M
Rosén, A
Post, C
Aaseth, J
Article History
Received: 29 December 2014
Revised: 15 April 2015
Accepted: 19 April 2015
First Online: 24 June 2015
Competing interests
: The authors declare no conflict of interest.