1. Center for Advanced Spine Care of Southern Arizona and Surgical Institute of Tucson,AZ,United States
2. Fundación Universitaria Sanitas, Bogotá, D.C., Colombia, Research Team, Centro de Columna, Bogotá, Colombia,,Colombia,United States
3. Centro de Cirugía de Mínima Invasión, CECIMIN - Clínica Reina Sofía, Bogotá, Colombia,,Colombia,United States
4. Department of Orthopedic Surgery,Munich,Germany
5. Orthopaedic Spine Surgeon, Director of Endoscopic Spine Clinic, Santiago,,Santiago,Chile
6. University of New Mexico School of Medicine,AZ,United States