Vainionpää, Raija
Peltokangas, Arto
Leinonen, Jukka
Pesonen, Paula
Laitala, Marja-Liisa
Anttonen, Vuokko
Article History
Received: 8 August 2016
Revised: 15 December 2016
Accepted: 15 January 2017
First Online: 3 March 2017
Competing interests
: The authors declare no conflict of interest.