Petchphapayom S. Prevalence and associated factors of urine methamphetamine positive in maternal labor pain at delivery room of Phangnga hospital. Kb. Med. J. [internet]. 2025 Jul. 21 [cited 2026 Sep. 2];8(1):29-43. available from: https://he01.tci-thaijo.org/index.php/KBJ/article/view/278205