title: Environment and cancer--how can the ecological study help us?
authors: Anthony B
authors: AB
authors: Miller
mesh_terms: D015982:Bias; D015340:Epidemiologic Research Design; D006801:Humans; D009369:Neoplasms / Q000453:epidemiology / Q000517:prevention & control; D014466:Ultraviolet Rays; D014807:Vitamin D / Q000502:physiology*
chemical_list: D014807:Vitamin D