Pencheva, Daliya Tsvetanova http://orcid.org/0000-0002-6590-7100
Heaney, Alice http://orcid.org/0000-0002-4534-6705
McKenna, Stephen P. http://orcid.org/0000-0003-4238-8333
Monov, Simeon Valentinov http://orcid.org/0000-0001-8074-3768
Funding for this research was provided by:
Bulgarian Ministry of Education and Scienc
Article History
Received: 8 May 2020
Accepted: 11 August 2020
First Online: 19 August 2020
Compliance with ethical standards
:
: The authors declare no conflict of interest.
: All procedures performed in the study are in accordance with the standards of the Human Research Ethics Committee of the University Clinical Hospital “St. Ivan Rilski” (approval reference number No. 1/03.06.2019) and the 1964 Helsinki Declaration and its later amendments.