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A case-control study of oral cancer in Beijing, People's Re..:

Zheng, Tongzhang ; Boyle, Peter ; Willett, Walter C....
European Journal of Cancer Part B: Oral Oncology.  29 (1993)  1 - p. 45-55 , 1993
Link: https://doi.org/10.1016/0964-1955(93)90010-c