Z. Zhiqiang, M. Jie, Y. Dexin, S. Haoqiang, and X. Dongdong, “Renal collision tumour of papillary cell carcinoma and chromophobe cell carcinoma with sarcomatoid transformation: A case report and review of the literature”, CUAJ, vol. 8, no. 7-8, pp. e536–9, Aug. 2014.