1 Department of Internal Medicine, Division of Pulmonary and Critical Care, University of Michigan Health System, Ann Arbor, Michigan, USA eviglian@med.umich.edu.
2 Department of Medicine, Division of Pulmonary and Critical Care, Northwestern University, Evanston, Illinois, USA.
3 Department of Medical Social Sciences, Northwestern University Feinberg School of Medicine, Chicago, Illinois, USA.
4 Department of Internal Medicine, Division of Pulmonary and Critical Care, University of Michigan Health System, Ann Arbor, Michigan, USA.
5 Veteran Affairs Center for Clinical Management Research, Ann Arbor, Michigan, USA.
6 University of Michigan Institute for Social Research, Ann Arbor, Michigan, USA.