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Nina P. Ayvazova
MC Clinical Institute for Reproductive Medicine 20, Skobelev Blvd. Pleven, 5800, Bulgaria
Violeta S. Rilcheva
MC Clinical Institute for Reproductive Medicine–Pleven, Bulgaria
Emiliana I. Konova
MC Clinical Institute for Reproductive Medicine–Pleven, Bulgaria
Roumen G. Roussev
Department of Anatomy, Histology, Cytology and Biology, Medical University–Pleven, Bulgaria
Pavel I. Rashev
Institute of Biology and Immunology of Reproduction“Acad. Kiril Bratanov”, Department of Immunobiology of Reproduction, Bulgarian Academy of Sciences, Bulgaria