1. Blood Research Laboratory, Pratt Clinic-New England Center Hospital, and the Department of Medicine, Tufts University School of Medicine, Boston, Mass.
2. Blood Research Laboratory, New England Center Hospital, Tufts University School of Medicine, Boston, Mass. Formerly Attacheé de Recherche au Centre Nationale de la Recherche Scientifique, Service du Professeur Gadrat, Pourpon, Toulouse, France.
3. Blood Research Laboratory, New England Center Hospital, and Assistant Professor of Medicine, Tufts University School of Medicine, Boston, Mass.
4. Blood Research La.boratory, New England Center Hospital, and Professor of Medicine, Tufts University School of Medicine, Boston, Mass.