1. Department of Anesthesiology & Perioperative Medicine Loyola University Medical Center Maywood Illinois USA
2. Department of Anesthesiology University of Colorado Anschutz Medical Campus Aurora Colorado USA
3. Department of Anesthesiology Nebraska Medical Center 984455 Nebraska Medical Center Omaha Nebraska USA
4. Department of Anesthesiology University of Washington School of Medicine Seattle Washington USA
5. Department of Anesthesiology UNC Hospitals N2198 UNC Hospitals North Carolina USA
6. Department of Anesthesiology Yale University/Yale New Haven Hospital New Haven Connecticut USA
7. Department of Anesthesiology & Perioperative Medicine University of Louisville Louisville Kentucky USA