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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. Effects of Smoking and Genotype On the PSR Index of Periodontal Disease in Adults Aged 18–49. MDPI, 2012.

Polk, Deborah E., et al. Effects of Smoking and Genotype On the PSR Index of Periodontal Disease in Adults Aged 18–49. MDPI, 2012.