From the Division of Clinical Immunology and Allergy (V.P., I.M., G.M.), University of Naples Federico II, School of Medicine, Napoli, Italy; Department of Pathology (E.A., L.V.), University of Pavia, School of Medicine, Pavia, Italy; and Department of Anesthesiology (B.L.-S., M.A.), Deutsches Herzzentrum Berlin, Berlin, Germany. (At 1998-03-17)