A simple scoring system for predicting early major complications in spine surgery: the cumulative effect of age and size of surgery

by Albert Vincent Berthier Brasil, Alisson R. Teles, Marcelo Ricardo Roxo, Marcelo Neutzling Schuster, Eduardo Ballverdu Zauk, Gabriel da Costa Barcellos, Pablo Ramon Fruett da Costa, Nelson Pires Ferreira, Jorge Luiz Kraemer, Marcelo Paglioli Ferreira, Pedro Luis Gobbato, Paulo Valdeci Worm