1 Neurosurgical Department, Spine Unit, Hospital Italiano de Buenos Aires, Buenos Aires, Argentina. Electronic address: federico.landriel@hospitalitaliano.org.ar.
2 ScienceRight Research Consulting, Ontario, Canada.
3 Neurosurgical Department, Spine Unit, Hospital Italiano de Buenos Aires, Buenos Aires, Argentina.
4 Spine Unit, Clínica de Cuyo, Mendoza, Argentina.
5 Department of Neurosurgery, Hospital São José - Santa Casa de Porto Alegre, Porto Alegre-RS, Brazil.
6 Department of Neurosurgery, Almenara Hospital, Lima, Perú.
7 Neurosurgical Department, Neurological Institute of Curitiba, Brazil.
8 Orthopedics Department - Spine Unit, Hospital Alemão Oswaldo Cruz, São Paulo. Universidad Estatal de Campinas, SP, Brazil.
9 Orthopedics Department - Spine Unit, Hospital Israelita Albert Einstein Sao Paulo, SP, Brazil.
11 Department of Orthopedics and Traumatology, Universidad del Desarrollo, Clínica Alemana, Santiago, Chile.
12 Department of Orthopedics and Traumatology, Fundación Universitaria de Ciencias de la Salud (FUCS). Hospital de San José - Hospital Infantil Universitario de San José Bogotá, Colombia.