Zhang, C., X. Guo, Y. Xu, X. Han, X. Wang, and G. Wang. “Lung Metastases at the Initial Diagnosis of High-Grade Osteosarcoma: Prevalence, Risk Factors and Prognostic Factors. A Large Population-Based Cohort Study”. São Paulo Medical Journal, vol. 137, no. 5, Oct. 2019, pp. 423-9, https://periodicosapm.emnuvens.com.br/spmj/article/view/923.