[1] Ctr Pain Relief, Charleston, WV 25301 USA
[2] Univ Calif Los Angeles, Los Angeles, CA USA
[3] Univ Florida, Jacksonville, FL USA
[4] Houston Pain Associates LLC, Houston, TX USA
[5] EHC Hosp, Anesthesia & Pain Management Dept, Morges, Switzerland
[6] Tri City, Ctr Pain Relief, Huntington, WV USA
[7] Kolling Inst Med Res, Sydney, NSW, Australia
[8] Univ Valencia, Sch Med, Valencia, Spain
[9] Spine & Pain Inst New York, Staten Isl, NY USA
[10] Johns Hopkins Univ, Sch Med, Dept Anesthesiol, Baltimore, MD USA
[11] Queen Valley Hosp, Napa Pain Inst, Napa Surg Ctr, Napa, CA USA
[12] Vanderbilt Univ, Nashville, TN USA
[13] Christiana Hosp, Newark, DE USA
[14] Univ Saskatchewan, Saskatoon, SK, Canada
[15] Stanford Univ, Palo Alto, CA 94304 USA
[16] St Antonius Hosp, Nieuwegein, Netherlands
[17] Integrated Pain Solut, Columbus, OH USA
[18] Natl Inst Pain, Tampa, FL USA
[19] Wake Forest Univ Baptist Hlth, Winston Salem, NC USA
[20] Thomas Jefferson Univ, Jefferson Med Coll, Dept Rehabil Med, Philadelphia, PA 19107 USA
[21] Metzger Staats Pain Management, Shrewsbury, NJ USA
[22] Cleveland Clin, Anesthesia Inst, Dept Pain Management & Res, Cleveland, OH 44106 USA
[23] Arizona Canc Pain & Surg Ctr, Phoenix, AZ USA
[24] Adv Pain Therapy PLLC, Hattiesburg, MS USA
[25] Alabama Pain Ctr, Huntsville, AL USA
[26] Cardinal Hill Rehabil Hosp, Lexington, KY USA
[27] Univ Calif San Diego, Dept Anesthesiol, San Diego, CA 92103 USA
[28] Cleveland Clin, Dept Pain Management, Cleveland, OH 44106 USA
[29] Univ Kentucky, Lexington, KY USA
[30] Univ Alabama Birmingham, Sch Nursing, Birmingham, AL USA
[31] Thomas Jefferson Univ, Jefferson Med Coll, MossRehab, Philadelphia, PA 19107 USA
[32] Bryn Mawr Hosp, Bryn Mawr, PA USA
[33] St Helena Hosp, Napa, CA USA
[34] Johns Hopkins Univ, Sch Med, Dept Crit Care Med, Baltimore, MD USA
[35] Johns Hopkins Univ, Sch Med, Dept Oncol, Baltimore, MD 21205 USA
[36] Gen Univ Hosp, Valencia, Spain
[37] Carolinas Pain Inst, Winston Salem, NC USA