5Vainio H,Kaaks R,Bianchini F.Weight control and physical activ-ity in cancer prevention:international evaluation of the evidence[J].Eur JCancer Prev,2002,11(2):94-100.
6Aguilera O,Fraga M F,Ballestar E,et al.Epigenetic inactivation ofthe Wnt antagonist DICKKOPF-1(DKK-1)gene in human colorectalcancer[J].Oncogene,2006,25(29):4116-4121.
7Hook S,Bonilla C,A kereyeni F,et al.NAT2and NER genetic vari-ants and sporadic prostate cancer susceptibility in African Americans[J].Prostate Cancer Prostatic Dis,2008,11(4):349-356.
8Cuyun Carter G B,Katz M L,Ferketich A K,et al.Dietary intake,food processing,and cooking methods among Amish and non-Amishadults living in ohio appalachia:relevance to nutritional risk factors forcancer[J].Nutrition and Cancer,2011,63(8):1208-1217.
10Mowat C,Carswell A,Wirz A,et al.Omeprazole and dietary nitrateindependently affect levels of vitamin and nitrite in gastric juice[J].Gastroenterology,1999,116(4):813-822.