Funding for this research was provided by:
Maria Curie-Sklodowska University in Lublin
Received: 25 August 2018
Accepted: 25 February 2019
First Online: 9 March 2019
Compliance with ethical standards
: The study was performed following the European Communities Council Directive of 22 September 2010 (2010/63/EU). The experimental procedures and protocols were approved by the Local Ethics Committee (Lublin, Poland).
: The funding source had no role in the study design, in the collection, analysis, and interpretation of data, in the writing of the report, and in the decision to submit the paper for publication.
: All authors declare that they have no conflict of interest.