1. Department of Neurology, Hospital Dr. Exequiel González Cortés, Santiago, Región Metropolitana, Chile
2. Faculty of Medicine, Universidad de Santiago de Chile, Santiago, Chile
3. Electromyography and Evoked Potentials Unit, Hospital Dr. Exequiel González Cortés, Región Metropolitana, Chile
4. Infectious Diseases Unit, Hospital Dr. Exequiel González Cortés, Región Metropolitana, Chile
5. Faculty of Medicine, Universidad de Chile, Santiago, Chile
6. Department of Radiology, Hospital Dr. Exequiel González Cortés, Región Metropolitana, Chile