Myntti, T
Rahkonen, L
Tikkanen, M
Pätäri-Sampo, A
Paavonen, J
Stefanovic, V
Article History
Received: 16 November 2015
Revised: 3 February 2016
Accepted: 1 March 2016
First Online: 7 April 2016
Competing interests
: The authors declare no conflict of interest.