1. Neuromuscular Disorders Clinic, National Institute of Neurology and Neurosurgery Dr. Manuel Velasco Suarez, Mexico City, Mexico
2. Department of Neurology, Mexican Institute of Social Security, La Raza National Medical Center Specialty Hospital, Mexico City, Mexico
3. Department of Neurogenetics, National Institute of Neurology and Neurosurgery Dr. Manuel Velasco Suarez, Mexico City, Mexico
4. Neuromuscular Pathology Laboratory, National Institute of Neurology and Neurosurgery Dr. Manuel Velasco Suarez, Mexico City, Mexico