1. Cancers of the oral cavity and pharynx;Mayne,2006
2. Food, nutrition and the prevention of cancer: A global prospective;World Cancer Research Fund/American Institute for Cancer Research,1997
3. Food, nutrition, physical activity, and the prevention of cancer: A global prospective;World Cancer Research Fund/American Institute for Cancer Research,2007
4. Quantitative methods in the review of epidemiologic literature;Greenland;Epidemiol Rev,1987
5. Meta-analysis in clinical trials;DerSimonian;Control Clin Trials,1986