From the University of L’Aquila, Departments of Experimental (L.P., A.T., S.M., E.T., E.A.) and Internal Medicine (M.C.B., G.D., A.S.), and the University La Sapienza, I Clinica Medica–Andrea Cesalpino Foundation (C.F.) and Department of Experimental Medicine (A.G.), Rome; and the Neuromed Institute, Pozzilli (A.G.), Italy. (At 1999-10-12)
