Hytti, Maria
Piippo, Niina
Korhonen, Eveliina
Honkakoski, Paavo
Kaarniranta, Kai
Kauppinen, Anu
Article History
Received: 7 July 2015
Accepted: 3 November 2015
First Online: 1 December 2015
Competing interests
: The authors declare no competing financial interests.