1. Department of Orthopedic Surgery, Arabellaklinik, Munich,,Germany
2. Clinical Professor, University of New Mexico School of Medicine, Albuquerque, New Mexico Desert Institute for Spine Care, Phoenix, AZ,,United States
3. Medical Technologies Consulting, Augsburg,,Germany
4. Department of Neurosurgery, Universidade Federal do Estado do Rio de Janeiro, Rio de Janeiro, Brazil
5. Centro Ortopedico Valqueire, Departamento de Full Endoscopia da Coluna Vertebral, Rio de Janeiro, Brazil
6. Center for Advanced Spine Care of Southern Arizona and Surgical Institute of Tucson, Tucson. AZ, United States