Funding for this research was provided by:
Agentúra Ministerstva Školstva, Vedy, Výskumu a Športu SR (VEGA 1/0136/19, VEGA 1/0124/17)
Russian Science Support Foundation (Grant 08-08)
Received: 25 March 2019
Accepted: 20 May 2019
First Online: 24 May 2019
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: Patients have not been involved in the study.
: No experiments have been performed including patients and/or animals.