Hinsni Y, Wittayalertpanya S. Modified Method for Serum Paraxanthine/Caffeine Ratio: An Index of CYP1A2 Activity. J Basic App Pharmacol [internet]. 2015 Jul. 23 [cited 2026 Aug. 30];24(2-3):113-20. available from: https://li01.tci-thaijo.org/index.php/JBAP/article/view/37255