1. Department of Neurosurgery, ABC Medical Center, Mexico City, Mexico
2. Department of Education, ABC Medical Center, Mexico City, Mexico
3. Plan de Estudios Combinados en Medicina, Facultad de Medicina, Universidad Nacional Autónoma de México, Mexico City, Mexico
4. Institute of Health Sciences, Universidad Autónoma del Estado de Hidalgo, San Juan Tilcuautla, Mexico
5. Department of Electromechanical Instrumentation, Instituto Nacional de Cardiología Ignacio Chávez, Mexico City, Mexico