1. Clinica Neurologica, Ospedale S. Maria della Misericordia, Università di Perugia, Perugia, Italy
2. Fondazione S. Lucia, I.R.C.C.S. Rome, Italy
3. Institute of Neuroscience and Physiology, Department of Psychiatry and Neurochemistry, The Sahlgrenska Academy at the University of Gothenburg, Mölndal, Sweden