Long, Hao, Menghao Wang, Jianping Gong, and Lan Hu. “Occurrence of Second Primary Cancer After Curative Resection of Cholangiocarcinoma: A Report of 5 Cases”. International Surgery Journal 4, no. 4 (March 25, 2017): 1455–1457. Accessed November 10, 2025. https://www.ijsurgery.com/index.php/isj/article/view/908.