Kalaydzhiev, Hristo
Ivanova, Petya
Stoyanova, Magdalena
Pavlov, Atanas
Rustad, Turid
Silva, Cristina L. M.
Chalova, Vesela I. http://orcid.org/0000-0001-5139-5389
Article History
Received: 25 April 2018
Accepted: 17 December 2018
First Online: 2 January 2019
Compliance with Ethical Standards
:
: The authors declare that they have no conflict of interest.
: This article does not contain any studies with human or animal subjects.