[1] Univ Cattolica Sacro Cuore, Inst Histol & Embryol, Fac Med, I-00168 Rome, Italy
[2] Univ Cattolica Sacro Cuore, Inst Neurosurg A Gemelli, Fac Med, I-00168 Rome, Italy
[3] Hosp San Raffaele, Stem Cell Res Inst, I-20132 Milan, Italy
[4] Milano Bicocca Univ, Dept Biol Sci & Biotechnol, Milan, Italy