Stoyanov, George S. http://orcid.org/0000-0002-6950-0615
Kobakova, Ina
Stoyanov, Dimo
Zhelezov, Marin
Angelova, Meglena
Dzhenkov, Deyan
Georgieva, Reneta
Ayetola, Lora
Kovachev, Emil
Ghenev, Peter
Tonchev, Anton B.
Article History
Received: 13 April 2018
Accepted: 4 May 2018
First Online: 16 May 2018
Compliance with Ethical Standards
:
: The authors declare that they have no conflict of interest.
: Informed consent was obtained from all participants.