Affiliation: | 1. Department of Neurosurgery, Hospital Regional Veracruz, Veracruz, Mexico;2. Department of Neurosurgery, American British Cowdray Medical Center, Mexico City, Mexico;1. Section of Neurosurgery, St. John Providence Hospital and Medical Centers, Michigan State University, Southfield, Michigan, USA;2. Department of Neurosurgery, William Beaumont School of Medicine, Oakland University, Rochester, Michigan, USA |