5Antropoli C,Perrotti P,Rubino M,et al.Nifedipine for local use in conservative treatment of anal fissures:preliminary results of a multicenter study[J].Dis Colon Rectum,1999,42:1011-1015.
6Perrotti P,Antropoli C,Molino D,et al.Conservative treatment of acute thrombosed external hemorrhoids with topical nifedipine[J].Dis Colon Rectum,2001,44:405-409.
7Cook TA,Brading AF,Mortensen NJ,et al.Differences in contractile properties of anorectal smooth muscle and the effects of calcium channel blockade.Br J Surg,1999,86:70.