Harea, Evghenii
Stoček, Radek
Storozhuk, Liudmyla
Sementsov, Yurii
Kartel, Nikolai
Article History
Received: 31 December 2017
Accepted: 25 April 2018
First Online: 30 April 2018
Compliance with ethical standards
:
: The authors declare that they have no competing interests.