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Journal of the National Cancer Institute|January 5, 1994
Dietary beta carotene and lung cancer risk in U.S. nonsmokersS T Mayne, D T Janerich, P Greenwald, et al.The New England Journal of Medicine|September 6, 1990
Lung cancer and exposure to tobacco smoke in the householdD T Janerich, W D Thompson, L R Varela, et al.Pageof 6