2Guo M,Li D.Anatomy of the levator ani muscle[J].Dis Colon Rectum,2007,50(10):1647-1655.
3Li D,Guo M.Morphology of the levator ani muscle[J].Dis Colon Rectum,2007;50(11):1831-1839.
4Guo M,Gao C,Li D,et al.Magnetic resonance imaging anatomy of the anal region[J].Dis Colon Rectum,2010,DCR-D-10-00043R2.
5Raizada V,Mittal RK.Pelvic floor anatomy and applied physiology[J].Gastroenterol Clin North Am,2008,37 (3):493-509.
6Shafik A.A new concept of the anatomy of the anal sphincter mechanism and physiology of defecation.IX.Single loop continence:a new theory of the mechanism of anal continence[J].Dis Colon Rectum,1980,23(1):37-43.
7Shafik A.A new concept of the anatomy of the anal sphincter mechanism and physiology of defecation.VII.Anal fistula:a simplified classification[J].Dis Colon Rectum,1979,22(6):408-414.
8Konerding MA,Dzemali O,Gaumann A,et al.Correlation of endoanal sonography with cross-sectional anatomy of the anal sphincter[J].Gastrointest Endosc,1999,50(6):804-810.
9Rociu E,Stoker J,Eijkemans MJ,et al.Normal anal sphincter anatomy and age-and sex-related variations at high-spatial-resolution endoanal MR imaging[J].Radiology 2000;217(2):395-401.
10Beets-Tan RG,Morren GL,Beets GL,et al.Measurement of anal sphincter muscles:endoanal US,endoanal MR imaging,or phased-array MR imaging? A study with healthy volunteers[J].Radiology,2001,220(1):81-89.
