title: Efficacy of the intradecidual sign and fallacy of the double decidual sac sign in the diagnosis of early intrauterine pregnancy.
authors: H C
authors: HC
authors: Yeh
mesh_terms: D005321:Extraembryonic Membranes / Q000000981:diagnostic imaging; D005260:Female; D006801:Humans; D011247:Pregnancy; D012680:Sensitivity and Specificity; D014463:Ultrasonography; D014599:Uterus / Q000000981:diagnostic imaging*