1. Orthopaedic and Traumatology Department, Institute of Orthopedics “Carlos E. Ottolenghi,” Hospital Italiano de Buenos Aires, Buenos Aires, Argentina
2. III Normal Anatomy Department, School of Medicine, University of Buenos Aires, Buenos Aires, Argentina
3. Department of Neurosurgery, University of California, Irvine, Orange, CA, USA
4. Department of Orthopaedics, University of California at Irvine, Orange, CA, USA
5. Intraoperative Monitoring, Pediatric Neurology Department, Hospital Italiano de Buenos Aires, Buenos Aires, Argentina