[1] Univ Missouri, PM&R Program, Columbia, MO 65211 USA
[2] West Virginia Univ, Dept Phys Med & Rehabil, Morgantown, WV USA
[3] Gershon Pain Specialists, Virginia Beach, VA USA
[4] Univ Texas Southwestern Med Ctr, Dallas, TX USA
[5] Columbia Pain Mgmt PC, Hood River, OR USA
[6] Medrina, Chicago, IL USA
[7] Univ Florida, Coll Med, PM&R Program, Gainesville, FL USA
[8] Rusk Rehabil, New York, NY USA