4Ferlay J,Shin H R,Bray F,et al.Estimates of worldwide burden of cancer in 2008:GLOBOCAN 2008[J].International Journal of Cancer,2010,127(12):2893~2917.
5Rolff H C,Simonsen L R,Rosenberg J.Clinical findings confirm national guidelines regarding primary gastroscopy for upper gastrointestinal symptoms[J].Cancer,2011,1(2):1~5.