title: Plasma pyridoxal phosphate in women taking oral contraceptives since at least five years.
mesh_terms: D003276:Contraceptives, Oral; D005260:Female; D005951:Glucose Tolerance Test; D006801:Humans; D011732:Pyridoxal Phosphate / Q000097:blood*; D012016:Reference Values; D013997:Time Factors
chemical_list: D003276:Contraceptives, Oral; D011732:Pyridoxal Phosphate