Funding for this research was provided by:
Unitatea Executiva pentru Finantarea Invatamantului Superior, a Cercetarii, Dezvoltarii si Inovarii (PN-II-PT-PCCA-2013-4-1937)
First Online: 31 July 2020
Compliance with Ethical Standards
: We wish to confirm that there are no known conflicts of interest associated with this publication.
: This is a review study. The BBU Research Ethics Committee has confirmed that no ethical approval/consent is required.