title: Measurement of variables: data quality control.
mesh_terms: D004032:Diet; D004044:Dietary Proteins; D005260:Female; D006801:Humans; D009584:Nitrogen / Q000652:urine; D010349:Patient Compliance; D011247:Pregnancy; D011786:Quality Control; D012107:Research Design
chemical_list: D004044:Dietary Proteins; D009584:Nitrogen