1. Division of Pulmonary and Critical Care, Department of Medicine,
2. Center for Bioethics and Social Sciences in Medicine, Medical School,
3. Institute for Healthcare Policy and Innovation, University of Michigan, Ann Arbor, Michigan;
4. VA Ann Arbor Healthcare System, U.S. Department of Veterans Affairs, Ann Arbor, Michigan
5. Department of Biostatistics and Center for Statistical Genetics, School of Public Health, and
6. Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, Johns Hopkins School of Medicine, Baltimore, Maryland;
7. Department of Medicine, Medical University of South Carolina, Charleston, South Carolina;
8. University of Minnesota Rural Health Research Center, Division of Health Policy and Management, School of Public Health, University of Minnesota, Minneapolis, Minnesota; and