1 Division of Rheumatology and Immunology and Division of Allergy, Pulmonary, and Critical Care Medicine, Department of Medicine, Vanderbilt University Medical Center, Nashville, TN 37232, USA. Electronic address: erin.m.wilfong@vumc.org.
2 Department of Medicine and Department of Anesthesia, Cardiovascular Research Institute, University of California San Francisco, San Francisco, CA, USA.