title: Creatinine and PABA as markers for completeness of collection of 24-hour urine samples.
mesh_terms: D010129:4-Aminobenzoic Acid / Q000652:urine*; D062365:Aminobenzoates / Q000652:urine*; D003404:Creatinine / Q000652:urine*; D006801:Humans; D013048:Specimen Handling / Q000592:standards
chemical_list: D062365:Aminobenzoates; D003404:Creatinine; D010129:4-Aminobenzoic Acid