1. Department of Cell Biology and Neuroscience, Istituto Superiore di Sanità, National Centre for Rare Diseases, Rome, Italy.
2. Department of Experimental and Diagnostic Medicine, Section of Medical Genetics, University of Ferrara, Ferrara, Italy.
3. Department of Biomedical and Biotechnology Sciences, Università di Cagliari, Cagliari, Italy.
4. Laboratory of Human Genetics, E.O. Ospedale Galliera, Genua, Italy.