1. Corporal Michael J. Crescenz Veterans Affairs Medical Center and School of Medicine and Center for Clinical Epidemiology and Biostatistics University of Pennsylvania Philadelphia Pennsylvania
2. School of Medicine University of Pennsylvania and Children's Hospital of Philadelphia Philadelphia Pennsylvania
3. Boston University School of Medicine Boston Massachusetts
4. School of Medicine and Center for Clinical Epidemiology and Biostatistics University of Pennsylvania Philadelphia Pennsylvania
5. Department of Pediatrics and Medicine Stanford University Stanford California
6. Medicine Service, VA Nebraska‐Western Iowa Health Care System and Department of Internal Medicine, Division of Rheumatology & Immunology University of Nebraska Medical Center Omaha Nebraska