Tavares-Júnior, M. C. M.; Munhoz, D. U.; Souza, J. P. V. de; Marcon, R. M.; Cristante, A. F.; Letaif, O. B. Evaluation of Alternative Halo Ring Positions in Children Using Tomography. Clinics 2019, 74, e781. https://doi.org/10.6061/clinics/2019/e781.