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              Petersen PE, Bourgeois D, Ogawa H, Estupinan-Day S, Ndiaye C. The global burden of oral diseases and risks to oral health. Bull World Health Organ. 2005;83(9):661-9.
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              Petersen, P. E., Bourgeois, D., Ogawa, H., Estupinan-Day, S., & Ndi- aye, C. (2005). The global burden of oral diseases and risks to oral health. Bulletin of the World Health Organization, 83, 661-669.
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              Petersen, P. E., Bourgeois, D., Ogawa, H., Estupinan-Day, S., & Ndiaye, Ch. (2005). The global burden of oral diseases and risks to oral health. Bulletin of the World Health Organization, 83 (9), 661 -669.
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              Petersen, P. E., Bourgeois, D., Ogawa, H., Estupinan-Day, S., Ndiaye, C. (2005). The global burden of oral diseases and risks to oral health. Bulletin of the World Health Organization, 83(9), pp. 661-669.
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