Tachkov, Konstantin
Mitov, Konstantin
Koleva, Yordanka
Mitkova, Zornitsa
Kamusheva, Maria
Dimitrova, Maria
Petkova, Valentina
Savova, Alexandra
Doneva, Miglena
Tcarukciev, Dimitar
Valov, Vasil
Angelova, Galia
Manova, Manoela
Petrova, Guenka http://orcid.org/0000-0001-8116-5138
Funding for this research was provided by:
Ministry of Education Bulgaria (National science program e-health)