1. Department of Histology and Embryology, Collegium Medicum in Bydgoszcz, Nicolaus Copernicus University in Torun, 85-092 Bydgoszcz, Poland
2. Faculty of Medicine, Collegium Medicum, Mazovian Academy in Płock, 08-110 Płock, Poland
3. Department of Clinical Pathomorphology, Collegium Medicum in Bydgoszcz, Nicolaus Copernicus University in Torun, 85-094 Bydgoszcz, Poland
4. Department of Dermatology, University of Münster, Von-Esmarch-Str. 58, 48149 Münster, Germany