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Open Access Research article

Causal assessment of smoking and tooth loss: A systematic review of observational studies

Takashi Hanioka*, Miki Ojima, Keiko Tanaka, Keitaro Matsuo, Fumihito Sato and Hideo Tanaka

BMC Public Health 2011, 11:221  doi:10.1186/1471-2458-11-221

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