1. Department of Histology and Embryology; Institute of Biostructure; Medical University of Warsaw; Warsaw, Poland
2. Department of Histology and Embryology; Department of Immunology; Institute of Biostructure; Medical University of Warsaw; Warsaw, Poland
3. Department of Clinical Cytology; Postgraduate Center of Medical Instruction; Warsaw, Poland
4. Department of Immunology; Institute of Biostructure; Medical University of Warsaw; Warsaw, Poland
5. Department of Pharmacology; Mount Sinai Medical Center; New York, NY