[1] Univ Naples Federico II, Dept Neurosci Reprod Sci & Odontostomatol, Multiple Sclerosis Clin Care & Res Ctr, Via Sergio Pansini 5, I-80131 Naples, Italy
[2] Imperial Coll, Dept Primary Care & Publ Hlth, London, England
[3] Univ Naples Federico II, Dept Publ Hlth, Naples, Italy
[4] Med Futura Grp, Naples, Italy