1. Departments of Medicine/GI & Cell BiologyVanderbilt University Medical Center Nashvillew Tennessee 37232 USA
2. Department of RheumatologyNew York University School of MedicineHospital for Joint Diseases New York New York 10003 USA
3. Division of RheumatologyUniversity of Michigan Medical Center Ann Arbor MI 48109‐0680
4. Division of RheumatologyHarvard Medical SchoolBeth Israel Deaconness Medical Center Boston Massachusetts 02215 USA
5. Division of RheumatologyUniversity Hospital Nijmegen 6500 HB Nijmegen The Netherlands
6. Rheumatic Diseases DivisionHarold C. Simmons Arthritis Research CenterThe University of Texas Southwestern Medical Center at Dallas Texas 75235‐8884 USA