1. Physical Medicine and Rehabilitation Department, San Juan, Puerto Rico, USA
2. Diagnostic Radiology Department, University of Puerto Rico, School of Medicine, San Juan, Puerto Rico, USA
3. Neurosurgery Department, University of Puerto Rico, School of Medicine, San Juan, Puerto Rico, USA
4. Department of Physical Medicine, Rehabilitation and Sports Medicine, University of Puerto Rico, School of Medicine, San Juan, Puerto Rico, USAa