Hoonwijit U, Waithum K, Tansrisawad N. Comparison of mitragynine stability in human blood in common blood collection tubes. Chula Med J [internet]. 2020 Oct. 1 [cited 2025 Apr. 15];64(4). available from: https://he05.tci-thaijo.org/index.php/CMJ/article/view/267