1. Department of Medicine, University of Cincinnati, Cincinnati 45267;
2. Veterans Affairs Medical Center at Cincinnati, Cincinati, Ohio 45220;
3. Department of Medicine, University of Tubingen, 72076 Tubingen, Germany;
4. Department of Medicine, Harvard Medical School, Boston, Massachusetts 02215;
5. Department of Medical Genetics, University of Helsinki Finland, 00014 Helsinki, Finland; and
6. Department of Biosciences at Novum, Karolinska Institute, 14157 Huddinge, Sweden