title: Dietary nitrites, headache, and cancer.
mesh_terms: D000284:Administration, Oral; D005770:Gastrointestinal Neoplasms / Q000139:chemically induced*; D006261:Headache / Q000139:chemically induced*; D006801:Humans; D009573:Nitrites / Q000008:administration & dosage / Q000009:adverse effects*
chemical_list: D009573:Nitrites