1. Department of Biomedical Sciences and Technologies (S.C., G.R.), Faculty of Medicine, University of L’Aquila, 67100 L’Aquila, Italy
2. Department of Histology and Medical Embryology (M.B., R.C.), Faculty of Medicine, University of Rome “La Sapienza,” 00161 Rome, Italy
3. Department of Public Health and Cell Biology (L.S.), Histology Section, University of Rome “Tor Vergata,” 00173 Rome, Italy