RT Journal Article SR Electronic T1 Review: medical therapies are less effective than surgery for anal fissure JF Evidence Based Medicine JO Evid Based Med FD BMJ Publishing Group Ltd SP 112 OP 112 DO 10.1136/ebm.9.4.112 VO 9 IS 4 YR 2004 UL http://ebm.bmj.com/content/9/4/112.abstract AB