Ludwig, A. F., Hubner, F. P., Caovilla, A. R., Weizemann, C., Barboza, T. V., Pereira, K. E., Stachelski, R. A., & de Carvalho, A. R. (2019). Comparison of disability between risk classifications for poor prognosis in chronic lumbago: observational study. Journal of Physiotherapy Research, 9(3), 347-352. https://doi.org/10.17267/2238-2704rpf.v9i3.2451