1 Division of Pulmonary and Critical Care, University of California, San Francisco, San Francisco, CA.
2 Department of Medicine, Division of Pulmonary and Critical Care Medicine, Johns Hopkins University School of Medicine, Baltimore, MD.
3 Department of Medicine, Division of Pulmonary and Critical Care and Sleep Medicine, University of Virginia, Charlottesville, VA.
4 Department of Medicine, Division of Pulmonary, Critical Care, and Sleep Medicine, University of Florida, Gainesville, FL.
5 Department of Thoracic Medicine and Surgery, Lewis Katz School of Medicine at Temple University, Philadelphia, PA.
6 Division of Pulmonary and Critical Care Medicine, Susan Pearlstine Sarcoidosis Center of Excellence, Medical University of South Carolina, Charleston, SC. Electronic address: jamesw@musc.edu.