1 Department of Medicine, Division of Pulmonary, Allergy, and Critical Care Medicine, Columbia University Irving Medical Center, New York, NY 10032, USA. Electronic address: cme2113@cumc.columbia.edu.
2 Department of Medicine, Division of Pulmonary, Allergy, and Critical Care Medicine, Columbia University Irving Medical Center, New York, NY 10032, USA; Department of Epidemiology, Columbia University Irving Medical Center, New York, NY 10032, USA.