Department of Medicine, Vanderbilt University Medical Center, Nashville, TN, United States. Electronic address: john.h.brems@vumc.org. Department of Medicine, Division of Allergy, Pulmonary, and Critical Care Medicine, Vanderbilt University Medical Center, Nashville, TN, United States. Department of Biostatistics, Vanderbilt University Medical Center, Nashville, TN, United States. Department of Emergency Medicine, Vanderbilt University Medical Center, Nashville, TN, United States.