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Polk DE, Wang X, Feingold E, Shaffer JR, Weeks DE, Weyant RJ, Crout RJ, McNeil DW, Marazita ML. Effects of Smoking and Genotype on the PSR Index of Periodontal Disease in Adults Aged 18–49. International Journal of Environmental Research and Public Health. 2012; 9(8):2839-2850. https://doi.org/10.3390/ijerph9082839

Polk, Deborah E., Xiaojing Wang, Eleanor Feingold, John R. Shaffer, Daniel E. Weeks, Robert J. Weyant, Richard J. Crout, Daniel W. McNeil, and Mary L. Marazita. 2012. "Effects of Smoking and Genotype on the PSR Index of Periodontal Disease in Adults Aged 18–49" International Journal of Environmental Research and Public Health 9, no. 8: 2839-2850. https://doi.org/10.3390/ijerph9082839

Polk, D. E., Wang, X., Feingold, E., Shaffer, J. R., Weeks, D. E., Weyant, R. J., Crout, R. J., McNeil, D. W., & Marazita, M. L. (2012). Effects of Smoking and Genotype on the PSR Index of Periodontal Disease in Adults Aged 18–49. International Journal of Environmental Research and Public Health, 9(8), 2839-2850. https://doi.org/10.3390/ijerph9082839