3Grandberg S, Wikland M, Karlsson B, et al. Endometrial thickness as mcasured by endovaginal ultrasonography for identifying endometrial abnormality.Am J Obstet Gynecol, 1991,164:47 ～ 52.
4Mark HE. A prospective comparison of transvaginal ultrasonography and diagnostic hysteroscopy in the evaluation of patients with abnormal uterine bleeding. Clinical implication. Am J Obstet Gynecol, 1995,172(2) :547.
5Nasri MN, Coast GJ. Correlation of ultrasound findings and endometrial histopathylogy in postmenopausal women. Br J Obstet Gynecol, 1989,96:1 333～ 1 338.
6Sheth S, Hamper U M, Kurman R J. Thickened endometrium in the postmopausal women: sonographic pathologic correalation. Radioly, 1993, 187:135 ～139.
7Varnet RE, Sparks JM. Cameron C. Transvaginal sonography of the endometrium in postmenopausal women. Obstet Gynecol, 1991,78(2): 195 ～ 199.
8Briley M, Lindsell D R. The role of transvaginal uhtrasound in the investigation of women with postmeonpausal bleeding Clin Radiol, 1998,53(7) :502～505.
9Dorum A, Kristensen G B, Langebrekke A, et al. Evaluation of endometrial thickness by endovaginal ultrasound in women with postmenopausal bleeding.Acta Obstet Gynecol Scand, 1993,72:116 ～ 119.
10Emanuel M H, Verdel M J, Wamsteker K, et al. A prospective comparison of transvaginal ultrasonography and diagnostic hysterocopy in the evaluation of patients with abnormal uterine bleeding: clinical implaications. Am J Obstet Gynecol, 1995,172: 547 ～ 552.
