Lukanapichonchat, Lumsum, Viroj Verachai, Sumnao Nilaban, Rossukhon Thanateerabunjong, and Kanchana Ratanaphan. 2021. “Co-Abuse Substances in Kratom Dependent Patients”. Journal of The Department of Medical Services 46 (3):96-104. https://he02.tci-thaijo.org/index.php/JDMS/article/view/255170.