1[1]Law PJ,Talbot RW,Bartram CI,et al.Anal endosonography in the evaluation of perianal sepsis and fistula in anus.Br J Surg,1989,76:752-725
2[2]Deen KI,Williams JG,Hutchinson R,et al.Fistulas in anus:endoanal ultrasonographic assessment assists decision making for surgery.Gut,1994,35:391-394
3[3]Graf D,Aeberhard P.Imaging of perianal and perirectal abscesses and fistulae using intraluminal ultrasound diagnosis.Swiss Surg,1995,6:294-297
4[4]Hussain SM,Stoker J,Schouten WR,et al.Fistula in ano:endoanal sonography versus endoanal MR imaging in classification.Radiology,1996,200:475-481
5[5]Poen AC,Felt-Bersma RJF,Eijsbouts QAJ,et al.Hydrogen peroxide-enhanced transanal ultrasound in the assessment of fistulo-in-ano.Dis Colon Rectum,1998,41:1147-1152
6[6]Ratto C,Gentile E,Merico M,et al.Howcan the assessment of fistula-in-ano be improved? Dis Colon Rectum,2000,43:1375-1382
7[7]Kuijpers HC,Schulpen T.Fistulography for fistula in ano.Dis Colon Rectum,1985,28:103-104