5Whiteford MH,Kilkenny J 3rd,Hyman N,et al.Practice parame-ters for the treatment of perianal abscess and fistula-in-ano(revised)[J].Dis Colon Rectum,2005,48(7):1337-1342.
6Thomson JP,Ross AH.Can the external sphincter be preserved inthe treatment of trans-sphincteric fistula-in-ano?[J].Int J Colorec-tal Dis,1989,4(4):247-250.