Natural history and surgical treatment of chordoma: a retrospective cohort study oleh Samuel Aguiar Júnior, Wesley Pereira Andrade, Glauco Baiocchi, Gustavo Cardoso Guimarães, Isabela Werneck Cunha, Daniel Alvarez Estrada, Sergio Hideki Suzuki, Luiz Paulo Kowalski, Ademar Lopes