,
Nyman, Anna
Korhonen, Tapio
Munck, Petriina
Parkkola, Riitta
Lehtonen, Liisa
Haataja, Leena
Article History
Received: 17 August 2016
Accepted: 1 March 2017
First Online: 24 May 2017
Competing interests
: The authors declare no conflict of interest.