Bäckman, Lars
Waris, Otto
Johansson, Jarkko
Andersson, Micael
Rinne, Juha O.
Alakurtti, Kati
Soveri, Anna
Laine, Matti
Nyberg, Lars
Article History
Received: 28 December 2016
Accepted: 28 June 2017
First Online: 2 August 2017
Competing Interests
: The authors declare that they have no competing interests.