1. Advanced Spine on Park Avenue, New York, NY 10022
2. Albert Einstein College of Medicine, Pain Attending, Lenox Hill Hospital, New York, NY
3. University of Kansas Medical Center, Kansas City, Kansas
4. The Center for Pain Relief, Spine and Nerve Centers of the Virginias, Charleston, West Virginia, USA
5. Factory CRO, Bilthoven, the Netherlands
6. Milestone Research Organization, San Diego, California, USA