Transvaginal ultrasound for preoperative assessment of myometrial invasion in patients with endometrial cancer: a systematic review and meta-analysis - Alcazar, J L; Orozco, R; Corral, T Martinez-Astorquiza; Juez, L; Utrilla-Layna, J; Minguez, J A; Jurado, M (Ultrasound In Obstetrics And Gynecology, 2015)