* From the Department of Pathology, Yale University School of Medicine, New Haven, the Thoracic Services, departments of Medicine and Surgery, Boston University School of Medicine, Boston, the Department of Internal Medicine, Lahey Clinic Foundation, Boston, and the Department of Medicine, University of Miami School of Medicine, Miami, Florida (address reprint requests to Dr. Gaensler, at the Thoracic Services, Boston University School of Medicine, 80 E. Concord St., Boston, Mass. 02118).
Supported in part by research grants (HE-05933 and HE-07277), a training grant (HTS-5562) and a research career award (5–K6-HE-1173), all from the National Heart Institute, National Institutes of Health, United States Public Health Service.
We are indebted to Dr. J. P. Lauricella, of Fort Lee, and Dr. S. S. Simbonis, of Teaneck, New Jersey, for referral of Case 5, to Dr. W. J. Hicken, of Baltimore, Maryland, for referral of Case 6, to Dr. A. H. Russakoff, of Birmingham, Alabama, for referral of Case 8 and to Dr. J. J. Shane and Dr. M. P. Brignola, of Philadelphia, Pennsylvania, for referral of Case 9.