Fig. 1From: Development and validation of a nomogram to predict cancer-specific survival in elderly patients with papillary thyroid carcinoma: a population-based studyFlowchart for inclusion and exclusion of patients with PTC. Patients in the training set were used to screen independent risk factors and establish a nomogram. Validation set and external validation set were used to test the accuracy of the model. Finally, a risk stratification system is established to identify high-risk patientsBack to article page