[1] Creighton Univ, Sch Med, St Josephs Hosp & Med Ctr, Reg Campus, Phoenix, AZ USA
[2] Harvard Med Sch, Beth Israel Deaconess Med Ctr, Dept Anesthesia Crit Care & Pain Med, 330 Brookline Ave, Boston, MA 02215 USA
[3] Harvard Med Sch, Massachusetts Gen Hosp, Dept Anesthesia Crit Care & Pain Med, Boston, MA 02215 USA
[4] Johns Hopkins Univ Hosp, Dept Anesthesia Crit Care & Pain Med, Baltimore, MD 21287 USA
[5] Pain Management Ctr Amer, Paducah, KY USA
[6] Louisiana State Univ, Hlth Sci Ctr, Shreveport, LA 71105 USA
[7] Louisiana State Univ, Dept Anesthesiol, Hlth Sci Ctr, New Orleans, LA USA
[8] Valley Anesthesiol & Pain Consultants, Phoenix, AZ USA
[9] Univ Arizona, Dept Anesthesiol, Coll Med Phoenix, Phoenix, AZ USA
[10] Creighton Univ, Sch Med, Dept Anesthesiol, Omaha, NE USA