RT Journal Article SR Electronic T1 Botulinum toxin A injections were more effective than glyceryl trinitrate for complete healing of anal fissure JF Evidence Based Medicine JO Evid Based Med FD BMJ Publishing Group Ltd SP 175 OP 175 DO 10.1136/ebm.4.6.175 VO 4 IS 6 YR 1999 UL http://ebm.bmj.com/content/4/6/175.abstract AB