wiriwong jagrawut. Retrospective study of negative predictive value of liver function test and ultrasonography for common bile duct stone after cholecystectomy at Maesot Hospital. crmj [internet]. 2020 Aug. 31 [cited 2026 Sep. 28];12(2):117. available from: https://he01.tci-thaijo.org/index.php/crmjournal/article/view/243071