1. Department of Anesthesiology and Pain Management, University of Texas Southwestern Medical Center, Dallas, Texas; the
2. Ochsner Clinic Foundation, New Orleans, Louisiana;
3. Presbyterian Hospital-Plano, Plano, Texas;
4. Yale University School of Medicine, New Haven, Connecticut;
5. David Geffen School of Medicine at UCLA, Los Angeles, California; the
6. University of Utah Health Sciences Center, Salt Lake City, Utah; the
7. University of Oklahoma, Oklahoma City, Oklahoma;
8. Harvard Medical School, Cambridge, Massachusetts; and
9. The University of Kansas Hospital, Kansas City, Kansas