Myntti, T
Rahkonen, L
Pätäri-Sampo, A
Tikkanen, M
Sorsa, T
Juhila, J
Helve, O
Andersson, S
Paavonen, J
Stefanovic, V
Article History
Received: 4 June 2016
Revised: 27 July 2016
Accepted: 29 July 2016
First Online: 1 September 2016
Competing interests
: The authors declare no conflict of interest.