title: Maternal nutrition. I. The urinary urea nitrogen-total nitrogen ratio as an index of protein nutrition.
mesh_terms: D000328:Adult; D001724:Birth Weight; D003404:Creatinine / Q000652:urine; D004032:Diet; D004044:Dietary Proteins; D005260:Female; D006801:Humans; D009584:Nitrogen / Q000652:urine*; D009747:Nutritional Physiological Phenomena; D011247:Pregnancy; D014508:Urea / Q000652:urine*
chemical_list: D004044:Dietary Proteins; D014508:Urea; D003404:Creatinine; D009584:Nitrogen