Kurkela, Jari L. O.
Lipponen, Arto
Hämäläinen, Jarmo A.
Näätänen, Risto
Astikainen, Piia
Article History
Received: 25 July 2016
Accepted: 15 November 2016
First Online: 20 December 2016
Competing interests
: The authors declare no competing financial interests.