HOONWIJIT, U.; WAITHUM, K. .; TANSRISAWAD, N. . Comparison of mitragynine stability in human blood in common blood collection tubes. Chulalongkorn Medical Journal, Bangkok, Thailand, v. 64, n. 4, 2020. Disponível em: https://he05.tci-thaijo.org/index.php/CMJ/article/view/267. Acesso em: 10 dec. 2025.