1. Department of Internal Medicine, Yale University School of Medicine, New Haven, CT 06510.
2. Department of Diagnostic Radiology, Yale University School of Medicine, New Haven, CT 06510.
3. Department of Molecular Biophysics and Biochemistry, Yale University School of Medicine, New Haven, CT 06510.
4. Departments of Internal Medicine and Molecular Biophysics and Biochemistry, Yale University School of Medicine, New Haven, CIT 06510.