1. From Duke University and VA Medical Centers (L.B.G.), Durham, NC; Denis Diderot University (P.A.), Paris; the University of Maryland (M.L.), Baltimore, Md; Rho Inc (S.G.), Newton, Mass; Pfizer, (M.M..) New York; Neurologic Consultants (A.C.), Nashville, Tenn; the University of Heidelberg (M.H.), Mannheim, Germany; the University of Copenhagen (H.S.), Denmark; and Rosalind Franklin University of Medicine and Science (K.M.A.W.), North Chicago, Ill.