International external validation of the SORG machine learning algorithms for predicting 90-day and one-year survival of patients with spine metastases using a Taiwanese cohort - Yang, Jiun-Jen; Chen, Chih-Wei; Fourman, Mitchell S.; Bongers, Michiel E. R.; Karhade, Aditya V.; Groot, Olivier Q.; Lin, Wei-Hsin; Yen, Hung-Kuan; Huang, Po-Hao; Yang, Shu-Hua; Schwab, Joseph H.; Hu, Ming-Hsiao (The Spine Journal, 2021)