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, Boston, Mass.
3. Blood Research Laboratory, New England Center Hospital, and Assistant Professor of Medicine, Tufts University School of Medicine, Boston, Mass.
4. Blood Research Laboratory, New England Center Hospital, and Professor of Mcdicine, Tufts University School of Medicine, Boston, Mass.