1 Division of Pulmonary, Critical Care and Sleep Medicine, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, Buffalo, New York.
2 Division of Chest Medicine, Taichung Veterans General Hospital, Taichung, Taiwan.
3 T.H. Chan School of Public Health, Harvard University, Boston, Massachusetts; and.
4 Division of Pulmonary, Critical Care, Sleep Medicine, University of Florida, Jacksonville, Florida.