9Warshaw AL, Castillo C. Pancreatic carcinoma. New Engl J Med, 1993,326 ( 7 ) :455 - 465.
10American gastroenterological association medical position statement : epidemiology, diagnosis, and treatment of pancreatic ductal adenocarcinoma. Gastroenterology, 1999,117 ( 6 ) : 1463 - 1484.