1. College of Medicine, University of Nebraska Medical Center, Omaha, Nebraska
2. Department of Internal Medicine, Division of Rheumatology, University of Nebraska Medical Center, Omaha, Nebraska
3. VA Nebraska-Western Iowa Health Care System, Omaha, Nebraska
4. Department of Internal Medicine, Division of Allergy and Immunology, University of Nebraska Medical Center, Omaha, Nebraska
5. Department of Internal Medicine, Division of General Medicine, University of Nebraska Medical Center, Omaha, Nebraska