[1] Univ Rome La Sapienza II, Fac Med, Dept Human Anat, Lab Electron Microscopy Pietro M Motta, Rome, Italy
[2] Univ Roma La Sapienza, Fac Med, Dept Human Anat, Lab Electron Microscopy Pietro M Motta, Rome, Italy
[3] Univ Rome La Sapienza II, Fac Med, Dept Surg, Rome, Italy