Storozhuk, Liudmyla http://orcid.org/0000-0002-9602-4933
Iukhymenko, Natalia
Article History
Received: 31 December 2017
Accepted: 15 April 2018
First Online: 25 April 2018
Compliance with ethical standards
:
: The authors declare that they have no competing interests. All authors read and approved the final manuscript.