1. Section of Human Anatomy and Histology; Department of Biomedical and Biotechnological Sciences; University of Catania; Catania Italy
2. San Raffaele Telematic University of Rome; Rome Italy
3. Section of Animal Biology; Department of Biological, Geological and Environmental Sciences; University of Catania; Catania Italy
4. Institute of Neurological Sciences; Italian National Research Council; Catania Italy