論文（英文）
A modified Japan Integrated Stage score for prognostic assessment in patients with hepatocellular carcinoma.
Ikai I, Takayasu K, Omata M, Okita K, Nakanuma Y, Matsuyama Y, Makuuchi M, Kojiro M, Ichida T, Arii S., and Yamaoka Y for the Liver Cancer Study Group of Japan. A modified Japan Integrated Stage score for prognostic assessment in patients with hepatocellular carcinoma. Journal of Gastroenterology 2006; 41(9): 884-892.