Matilainen, Sanna
Isohanni, Pirjo
Euro, Liliya
Lönnqvist, Tuula
Pihko, Helena
Kivelä, Tero
Knuutila, Sakari
Suomalainen, Anu
Article History
Received: 13 March 2014
Revised: 26 May 2014
Accepted: 30 May 2014
First Online: 2 July 2014
Competing interests
: The authors declare no conflict of interest.
Free to read: This content has been made available to all.