Wannasunthornchai, Piyachat, A Polsri, and M Songthamwat. 2023. “Efficacy of Post Total Knee Arthroplasty Pain Control by Adductor Canal Block plus Morphine Around the Clock versus Adductor Canal Block plus Patient Control Analgesia Intravenous Morphine: a Randomized Controlled Trial”. Thai Journal of Anesthesiology 49 (2):101-8. https://he02.tci-thaijo.org/index.php/anesthai/article/view/261529.