N P, Y P, C ltthipanichpong. Relationship between Caffeine Concentrations in Serum and Saliva in Normal Volunteers. J Basic App Pharmacol [internet]. 2015 Jul. 19 [cited 2026 Aug. 30];13:12. available from: https://li01.tci-thaijo.org/index.php/JBAP/article/view/36854