Hu, JinYu, et al. “Clinical Risk Factors of Carbohydrate Antigen-125, Cytokeratin Fragment 19, and Neuron-Specific Enolase in Liver Metastases from Elderly Lung Cancer Patients Running Title: Risk Factors of Liver Metastasis from Lung Cancer”. American Journal of Translational Medicine, vol. 7, no. 4, Dec. 2023, pp. 372-81, https://journals3.publicknowledgeproject.org/index.php/ajtm/article/view/2985.