1. VA Nebraska‐Western Iowa Health Care System & Division of Rheumatology & Immunology University of Nebraska Medical Center Omaha Nebraska USA
2. Division of Pulmonary, Critical Care, and Sleep Medicine University of Nebraska Medical Center Omaha Nebraska USA
3. Department of Biostatistics University of Nebraska Medical Center Omaha Nebraska USA
4. Seattle VA Seattle Washington USA
5. Division of Rheumatology VA Salt Lake City & University of Utah Salt Lake City Utah USA
6. Division of Clinical Immunology and Rheumatology University of Alabama at Birmingham Birmingham Alabama USA
7. Division of Rheumatology Corporal Michael J. Crescenz VA & University of Pennsylvania Philadelphia Pennsylvania USA