1. Department of Biomedical and Biotechnological Sciences, School of Medicine; University of Catania; Catania Italy
2. Departments of Neurology and Biochemistry; and Neuroethics Studies Program, Pellegrino Center for Clinical Bioethics; Georgetown University Medical Center; Washington DC USA
3. Department of Chemical, Biological, Pharmaceutical and Environmental Sciences; University of Messina; Messina Italy
4. Department of Clinical and Experimental Medicine, School of Medicine; University of Catania; Catania Italy
5. Environmental Health Sciences Division, School of Public Health; University of Massachusetts; Amherst Massachusetts USA