Caffeine withdrawal elevates urinary MHPG excretion.
D002110:Caffeine; D006801:Humans; D008734:Methoxyhydroxyphenylglycol / Q000652:urine; D013375:Substance Withdrawal Syndrome / Q000652:urine*
D002110:Caffeine; D008734:Methoxyhydroxyphenylglycol