1 Universidad Autonoma de Nuevo Leon, School of Medicine, Human Anatomy Department, Monterrey, Mexico.
2 Instituto Mexicano del Seguro Social, Delegación de Nuevo Leon, Monterrey, Mexico.
3 Universidad Autonoma de Nuevo Leon, University Hospital "Dr. Jose Eleuterio Gonzalez", Traumatology and Orthopedic Surgery Departament, Monterrey, Mexico.
4 Universidad Autonoma de Nuevo Leon, School of Medicine, Histology Department, Monterrey, Mexico.
5 Ministry of Health of the State of Nuevo Leon, Monterrey, Mexico.
6 Universidad Autonoma de Nuevo Leon, University Hospital "Dr. Jose Eleuterio Gonzalez", Neurosurgery Department, Monterrey, Mexico.
7 Universidad Autonoma de Nuevo Leon, University Hospital "Dr. Jose Eleuterio Gonzalez", Endocrinology, Monterrey, Mexico.
8 Universidad Autonoma de Nuevo Leon, School of Medicine and University Hospital "Dr. Jose Eleuterio Gonzalez", Research Vice-Dean's Office, Monterrey, Mexico.