title: Letter: Circadian rhythm of the total hydroxyproline: creatinine ratio in urine.
mesh_terms: D000293:Adolescent; D000328:Adult; D002648:Child; D002940:Circadian Rhythm; D003404:Creatinine / Q000652:urine*; D006801:Humans; D006909:Hydroxyproline / Q000652:urine*
chemical_list: D003404:Creatinine; D006909:Hydroxyproline