The extrahepatic cholangiocarcinoma data comes form the US Surveilance, Epidemiology, and End Results (SEER) program of the National Cancer Institute.
Hankey B., Ries L., and Edwards B. (1999). The surveillance, epidemiology, and end results program a national resource. Cencer Epidemiology Biomarkers and Prevention, 12:1117-1121.
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