[1] Beth Israel Deaconess Med Ctr, Anesthesiol Pain Management, Boston, MA 02215 USA
[2] Harvard Med Sch, Boston, MA 02115 USA
[3] Beth Israel Deaconess Med Ctr, Anesthesiol Pain Med, Boston, MA 02215 USA
[4] Louisiana State Univ, Anesthesiol Pain Med, Hlth Sci Ctr, Shreveport, LA 71105 USA
[5] Brigham & Womens Hosp, Anesthesiol Chron Pain Management, 75 Francis St, Boston, MA 02115 USA
[6] Louisiana State Univ, Hlth Sci Ctr, Pain Management, Shreveport, LA 71105 USA