1. From The Cleveland Clinic Foundation, Cleveland, Ohio; Hospital Clinic, University of Barcelona, Institut d'Investigacions Biomediques August Pi y Sunyer, Barcelona, Spain; Boston University School of Medicine, Boston, Massachusetts; Emory University School of Medicine, Atlanta, Georgia; Johns Hopkins University School of Medicine, Baltimore, Maryland; Arcispedale Santa Maria Nuova, Reggio Emilia, Italy; and Centocor Research and Development, Inc., Malvern, Pennsylvania.