Funding for this research was provided by:
Autoritatea Natională pentru Cercetare Stiintifică (PN-II-ID-PCE-2011-3-0546, PN-III-P4-ID-PCE-2016-0303)
Received: 14 November 2018
Accepted: 8 December 2020
First Online: 2 February 2021
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: This article does not contain any studies with human participants or animals performed by any of the authors.
: Not applicable.