title: Questions raised by study on cancer mortality in oil refinery workers.
mesh_terms: D004812:Epidemiologic Methods; D004938:Esophageal Neoplasms / Q000401:mortality*; D006801:Humans; D009784:Occupational Diseases / Q000401:mortality*; D010578:Petroleum; D012142:Respiratory Tract Neoplasms / Q000401:mortality*; D013274:Stomach Neoplasms / Q000401:mortality*
chemical_list: D010578:Petroleum