Stedt, H
Samaranayake, H
Kurkipuro, J
Wirth, G
Christiansen, L S
Vuorio, T
Määttä, A-M
Piškur, J
Ylä-Herttuala, S
Article History
Received: 10 October 2014
Revised: 8 December 2014
Accepted: 8 December 2014
First Online: 23 January 2015
Competing interests
: The authors declare no conflict of interest.