1. VA Center for Clinical Management Research, LTC Charles Kettles VA Medical Center, Ann Arbor, Michigan, USA;
2. Gastroenterology Service, LTC Charles Kettles VA Medical Center, Ann Arbor, Michigan, USA;
3. Division of Gastroenterology & Hepatology, University of Michigan Medicine, Ann Arbor, Michigan, USA;
4. Department of Statistics, University of Michigan Medicine, Ann Arbor, Michigan, USA;
5. School of Nursing, Yale University, New Haven, Connecticut, USA;
6. Section on Pulmonary, Critical Care & Sleep Medicine, Department of Internal Medicine, Yale University, New Haven, Connecticut, USA;
7. Division of Rheumatology, Department of Internal Medicine, University of Michigan Medicine, Ann Arbor, Michigan, USA;
8. Rheumatology Service, LTC Charles Kettles VA Medical Center, Ann Arbor, Michigan, USA;
9. Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, University of Michigan Medicine, Ann Arbor, Michigan, USA;
10. Pulmonary Service, LTC Charles Kettles VA Medical Center, Ann Arbor, Michigan, USA.