1. Department of Anesthesiology and Perioperative Medicine, Mayo Clinic, Phoenix, Arizona;
2. Robert D. and Patricia E. Kern Center for the Science of Health Care Delivery, Mayo Clinic, Rochester, Minnesota
3. Department of Anesthesiology and Perioperative Medicine, UCLA David Geffen School of Medicine, Los Angeles, California
4. Department of Anesthesiology, University of Maryland, Baltimore, Baltimore, Maryland
5. Department of Surgery, Emory University School of Medicine, Atlanta, Georgia
6. Anesthesiology Institute, Cleveland Clinic, Cleveland, Ohio
7. Deparment of Anesthesiology and Perioperative Medicine, University of Alabama at Birmingham, Birmingham, Alabama.