Meinila, J
Valkama, A
Koivusalo, S B
Rönö, K
Kautiainen, H
Lindström, J
Stach-Lempinen, B
Eriksson, J G
Erkkola, M
Article History
Received: 22 September 2016
Revised: 21 November 2016
Accepted: 30 November 2016
First Online: 1 February 2017
Competing interests
: The authors declare no conflict of interest.