1. The Veterans Affairs Western New York Healthcare System and the Western New York Respiratory Research Center, Division of Pulmonary, Critical Care, and Sleep Medicine, Department of Medicine, University at Buffalo School of Medicine and Biomedical Sciences, Buffalo, NY, USA
2. Department of Medicine, Winthrop-University Hospital, Mineola, NY; Department of Medicine, SUNY Stony Brook School of Medicine, Stony Brook, NY, USA
3. Department of Internal Medicine/Geriatrics, University of Wisconsin, Madison, WI Medical College of Wisconsin, Milwaukee, WI, USA