1 Department of Statistical Sciences (N.S.), University of Padova, 35121 Padova, Italy; Department of Psychiatry (N.S., G.A.F.), State University of New York at Buffalo, Buffalo, New York 14215; and Laboratory of Psychosomatics and Clinimetrics (L.S., G.A.F.), Department of Psychology, University of Bologna, 40127 Bologna, Italy.