1. Department of Histology and Embryology; Medical Univertiry of Warsaw; Chałubinskiego 5 St Warsaw 02-004 Poland
2. Department of Clinical Anatomy; Medical Univertiry of Warsaw; Chałubinskiego 5 St Warsaw 02-004 Poland
3. Department of Pathology; Medical University of Warsaw; Chałubinskiego 5 St Warsaw 02-004 Poland