Cross-cultural adaptation and assessment of the reliability and validity of the Core Outcome Measures Index (COMI) for the Brazilian-Portuguese language - Damasceno, L. H. F.; Rocha, P. A. G.; Barbosa, E. S.; Barros, C. A. M.; Canto, F. T.; Defino, Helton Luiz Aparecido; Mannion, A. F. (European Spine Journal, 2012)