Vähätalo, L H
Ruohonen, S T
Mäkelä, S
Ailanen, L
Penttinen, A-M
Stormi, T
Kauko, T
Piscitelli, F
Silvestri, C
Savontaus, E http://orcid.org/0000-0003-3421-0367
Di Marzo, V
Article History
Received: 15 August 2014
Revised: 12 December 2014
Accepted: 23 December 2014
First Online: 27 April 2015
Competing interests
: The authors declare no conflict of interest.