Zhao B, Lu J, Yin J, Liu H, Guo X, Yang Y, Ge N, Zhu Y, Zhang H, Xing J. A functional polymorphism in PER3 gene is associated with prognosis in hepatocellular carcinoma. Liver International. 2012 Jul 19;32(9):1451–9. doi: 10.1111/j.1478-3231.2012.02849.x.