Miteva, Lyuba http://orcid.org/0000-0002-0028-7692
Trenova, Anastasiya
Slavov, Georgi
Stanilova, Spaska
Funding for this research was provided by:
Trakia University (2/2017)
Medical University - Plovdiv (HO-02/2014)
Article History
Received: 7 September 2018
Accepted: 11 December 2018
First Online: 15 December 2018
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: The study was designed and performed in agreement with the Declaration of Helsinki and was approved by the University Ethics Committee of Medical University of Plovdiv (protocol no. 3/26.06.2014).
: Informed consent was obtained from all individual participants included in the study.