1 Pulmonary Medicine/Critical Care Section, Providence VA Medical Center, 830 Chalkstone Avenue, Providence, RI 02908, USA. Electronic address: linda_nici@brown.edu.
2 Pulmonary Medicine, Critical Care-Medical, Saint Francis Medical Group, Inc, Department of Pulmonary Medicine, 114 Woodland Street, Hartford, CT 06105, USA. Electronic address: rzuwalla@stfranciscare.org.