1 Medical Service, VA Palo Alto Health Care System, 3801 Miranda Ave, Palo Alto, CA 94304, United States. Electronic address: Omar.Usman@va.gov.
2 Department of Anesthesiology and Critical Care, University of Pennsylvania, 3400 Spruce Street, Suite 680 Dulles, Philadelphia, PA 19104, United States. Electronic address: Asad.Usman@pennmedicine.upenn.edu.
3 Department of Emergency Medicine, University of Wisconsin-Madison, 800 University Dr. Suite 310, Madison, WI 53705, United States. Electronic address: maward@medicine.wisc.edu.