Kangas, Reeta
Törmäkangas, Timo
Fey, Vidal
Pursiheimo, Juha
Miinalainen, Ilkka
Alen, Markku
Kaprio, Jaakko
Sipilä, Sarianna
Säämänen, Anna-Marja
Kovanen, Vuokko
Laakkonen, Eija K.
Article History
Received: 30 August 2016
Accepted: 10 January 2017
First Online: 14 February 2017
Competing interests
: The authors declare no competing financial interests.