1. Utsunomiya T, Shimada M, Kudo M, Ichida T, Matsui O, Izumi N, et al. Nationwide study of 4741 patients with Non-B Non-C hepatocellular carcinoma with special reference to the therapeutic impact. Ann Surg. 2013;00:1–10.
2. Ikai I, Arii S, Okazaki M, Okita K, OmataM KM, Takayasu K, et al. Report of the 17 th nationwide follow-up survey of primary liver cancer in Japan. Hepatol Res. 2007;37:676–91.
3. Liver Cancer Study Group of Japan. The general rules for the clinical and pathological study of primary liver cancer. 3rd ed. Tokyo: Kanehara; 2010.
4. Hirohashi S, Blum HE, Ishak KG. Tumours of the liver and intrahepatic bile ducts. In: Hamilton SR, Aaltonen LA, editors. World Health Organisation classification of tumours: pathology and genetics of tumours of the digestive system. Lyon: IARC Press; 2000. p. 157–202.
5. Tanaka H, Imai Y, Hiramatsu N, Hiramatsu N, Ito Y, Imanaka K, et al. Declining incidence of hepatocellular carcinoma in Osaka, Japan, from 1990 to 2003. Ann Intern Med. 2008;148:820–6.