Nitrates: epidemiological evidence.
D004938:Esophageal Neoplasms / Q000139:chemically induced* / Q000453:epidemiology; D005308:Fertilizers / Q000009:adverse effects; D005504:Food Analysis; D006801:Humans; D009566:Nitrates / Q000009:adverse effects* / Q000032:analysis; D013274:Stomach Neoplasms / Q000139:chemically induced* / Q000453:epidemiology; D014874:Water Pollutants, Chemical / Q000009:adverse effects; D014881:Water Supply / Q000032:analysis
D005308:Fertilizers; D009566:Nitrates; D014874:Water Pollutants, Chemical