1. Christus Santa Rosa Spine Clinic , San Antonio, TX 78229, United States
2. University of Texas at San Antonio , San Antonio, TX 78249, United States
3. Comprehensive Specialty Care , Edmond, OK 73034, United States
4. Baylor Scott & White PM&R Department, Baylor Institute for Rehabilitation , Dallas, TX 75246, United States
5. University College Dublin School of Medicine, University College Dublin , Belfield, Dublin 4D04 V1W8, Ireland
6. Massachusetts General Hospital, Harvard Medical School Department of Interventional Neuroradiology , Boston, MA 02114, United States