No abstract available
MeSH terms
-
Case-Control Studies
-
Confounding Factors, Epidemiologic
-
Humans
-
Neoplasms / epidemiology*
-
Neoplasms / prevention & control*
-
Prospective Studies
-
Randomized Controlled Trials as Topic
-
Treatment Failure
-
United States / epidemiology
-
beta Carotene / therapeutic use*