1. 1Department of Medical Biology, Medical University of Plovdiv, Plovdiv, 4000, Bulgaria
2. 2Service d’Anatomie et de Cytologie Pathologiques, Centre Hospitalier de Lagny-Marne-La-Vallée, Lagny-sur-Marne, 77495, France
3. 3Department of General and Clinical Pathology, Medical University of Pleven, Pleven, 6500, Bulgaria