Munukka, Eveliina
Rintala, Anniina
Toivonen, Raine
Nylund, Matts
Yang, Baoru
Takanen, Anna
Hänninen, Arno
Vuopio, Jaana
Huovinen, Pentti
Jalkanen, Sirpa
Pekkala, Satu
Article History
Received: 3 June 2016
Revised: 10 November 2016
Accepted: 27 January 2017
First Online: 4 April 2017
Competing interests
: The authors declare no conflict of interest.