IGHV Mutational Status in a Cohort of Bulgarian CLL Patients: High Unmutated CLL Prevalence in North-East Bulgaria. - Yosifova, A; Micheva, I; Donchev, M; Tincheva, S; Ormandjiev, S; Genova, J; Pavlova, Z; Todorova, A (Balkan Journal of Medical Genetics, 2024)