Kostadinova, Tsvetelina http://orcid.org/0000-0001-6760-8043
Ivanova, Liliya Ivanova
Todorova, Tatina Todorova
Stoykova, Zhivka
Staykov, Dobromir
Efraim, Merlin
Gercheva, Liana
Funding for this research was provided by:
Medical University - Varna (16003/2016)
Article History
Received: 28 September 2018
Accepted: 25 January 2019
First Online: 31 January 2019
Compliance with Ethical Standards
:
: Authors declare absence of any conflict of interest related to this manuscript.
: This project received a Grant No 16003/2016 from the Medical University Varna.
: The study was approved by the Ethics Committee of the Medical University Varna.