1. Division of Medical Genetics and the Clayton Laboratories, Department of Medicine and The Johns Hopkins University School of Medicine and Hospital, Baltimore, Md., and St. Elizabeth’s Hospital, Brighton, Mass.
2. Louisiana State University Medical School, New Orleans, La.
3. Division of Medical Genetics, Department of Medicine, The Johns Hopkins University School of Medicine and Clayton Laboratories, Baltimore, Md.
4. Facultad de Medicina, Universidad Peruana, Cayetano Heredia, Lin]a, Peru
5. University of Texas Medical School at San Antonio, San Antonio, Texas.
6. Tufts University School of Medicine and Director of Medicine and Research, St. Elizabeth's Hospital, Brighton, Mass.