Karalilova, Rositsa http://orcid.org/0000-0001-8030-0529
Kazakova, Maria
Sapundzhieva, Tanya
Dichev, Valentin
Batalov, Zguro
Sarafian, Victoria
Batalov, Anastas
Article History
Received: 5 June 2019
Accepted: 26 July 2019
First Online: 2 August 2019
Compliance with ethical standards
:
: The authors report no conflict of interest concerning this article.
: The study was approved by ethics committee of Medical University of Plovdiv (protocol № 3/31.05.2018). All study procedures were performed according to the ethical principles of the Declaration of Helsinki and Good Clinical Practice.
: Voluntarily signed informed consent was obtained from all participants before entering the study in accordance with the ethical recommendations of the Helsinki Declaration.