1. Department of Pathophysiology, University of Warmia and Mazury in Olsztyn, 2 Oczapowskiego Street, 10-719 Olsztyn, Poland
2. Histology and Embryology Department, I. Horbachevsky Ternopil National Medical University, 1 Maidan Voli Street, 46001 Ternopil, Ukraine
3. Department of Medical Biology and Genetics, Bukovinian State Medical University, 15 Yu. Fedkvich Street, 58000 Chernivtsi, Ukraine
4. Department of Normal Anatomy, Danylo Halytsky Lviv National Medical University, 69 Pekarska Street, 79010 Lviv, Ukraine