1Yiou R. Costa P, Haab F, el al. Functional anatomy of the pel- vicfloor [J] . ProgUrol, 2009, 19 (13): 916-925.
2Tooz-Hoboson P, Khullar V, Cardozo L. Three dimensional ul trasound ultrasound: a novel technique for investigating the ure thral sphincter in the third trimester of pregnancy [J] . Ultra sound Obstet Gvnecol, 2001, 17 (5): 421-424.
3Thyer I, Shek C. Diez HP. New imaging method for assessing pelvk floor biomechanics [J] . Uhrasound Obstel Gynecol, 2008, 31 (2): 201-205.
4Dietz HP. Quantificttion of major morphological abnormalities of the levator ani [J]. Ultrasound Obstet Gynfcol. 2007, 29 (3): 329-334.
