1. Department of Neurology; University of California San Francisco; San Francisco California U.S.A.
2. Department of Neurology; Bambino Gesú Children's Hospital and Research Institute; Rome Italy
3. Department of Experimental Medicine; Second University of Naples; Naples Italy
4. Department of Pediatrics; University of Arkansas for Medical Sciences; Little Rock Arkansas U.S.A.
5. Department of Pediatrics; University of California San Francisco; San Francisco California U.S.A.
6. Department of Health Science; University of Molise; Campobasso Italy
7. Department of Neurological Sciences; University of Vermont; College of Medicine; Burlington Vermont U.S.A.