1. Department of Histology and Embryology, Collegium Medicum in Bydgoszcz, Nicolaus Copernicus University in Torun, 85-092 Bydgoszcz, Poland
2. Department of Cell Systems and Anatomy, UT Health, Long School of Medicine, San Antonio, TX 78229, USA
3. Department of Dermatology, Comprehensive Cancer Center, University of Alabama at Birmingham, Birmingham, AL 35294, USA
4. Pathology and Laboratory Medicine Service, VA Medical Center, Birmingham, AL 35294, USA
5. Department of Dermatology, University of Münster, Von-Esmarch-Str. 58, 48149 Münster, Germany