1 Department of Anatomical Sciences, Histological, Medico-Legal and Locomotor, University of Rome "Sapienza", Viale Regina Elena, 336, 00161 Rome, Italy. Electronic address: l.montanarivergallo@libero.it.
2 Department of Anatomical Sciences, Histological, Medico-Legal and Locomotor, University of Rome "Sapienza", Viale Regina Elena, 336, 00161 Rome, Italy.