Pärnänen, Katariina
Karkman, Antti
Tamminen, Manu
Lyra, Christina
Hultman, Jenni
Paulin, Lars
Virta, Marko
Article History
Received: 11 July 2016
Accepted: 3 October 2016
First Online: 21 October 2016
Competing interests
: The authors declare no competing financial interests.