An official website of the United States government
The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before
sharing sensitive information, make sure you’re on a federal
government site.
The site is secure.
The https:// ensures that you are connecting to the
official website and that any information you provide is encrypted
and transmitted securely.
Kostadinova I, Zaprianov G, Krustev A, Toreva D, Lukanov J.Kostadinova I, et al.Folia Med (Plovdiv). 1991;33(3):47-52.Folia Med (Plovdiv). 1991.PMID: 1841068No abstract available.
Manova MG, Kostadinova II, Rangelov AA.Manova MG, et al. Among authors: kostadinova ii.Folia Med (Plovdiv). 2000;42(3):20-5.Folia Med (Plovdiv). 2000.PMID: 11347331Clinical Trial.