Ferdek, Pawel E
Jakubowska, Monika A
Nicolaou, Polina
Gerasimenko, Julia V
Gerasimenko, Oleg V
Petersen, Ole H
Article History
Received: 12 August 2016
Revised: 20 December 2016
Accepted: 11 January 2017
First Online: 2 March 2017
Competing interests
: The authors declare no conflict of interest.