Kiiski, Kirsi
Lehtokari, Vilma-Lotta
Löytynoja, Ari
Ahlstén, Liina
Laitila, Jenni
Wallgren-Pettersson, Carina
Pelin, Katarina
Article History
Received: 19 December 2014
Revised: 28 May 2015
Accepted: 19 June 2015
First Online: 22 July 2015
Competing interests
: The authors declare no conflict of interest.