[1] Harvard Med Sch, Beth Israel Deaconess Med Ctr, Dept Anesthesia Crit Care & Pain Med, Boston, MA 02115 USA
[2] Georgetown Univ, Sch Med, Washington, DC USA
[3] Univ Arizona, Dept Anesthesiol, Coll Med Phoenix, Phoenix, AZ USA
[4] Louisiana State Univ Hlth Shreveport, Dept Anesthesiol, Shreveport, LA USA
[5] Creighton Univ, Sch Med, Dept Anesthesiol, Omaha, NE USA
[6] Valley Pain Consultants Envision Phys Serv, Phoenix, AZ USA