Mäkipää, Raisa
Rajala, Tiina
Schigel, Dmitry
Rinne, Katja T
Pennanen, Taina
Abrego, Nerea
Ovaskainen, Otso
Article History
Received: 20 December 2016
Revised: 18 February 2017
Accepted: 3 March 2017
First Online: 21 April 2017
Competing interests
: The authors declare no conflict of interest.