Comment on

• Glyceryl trinitrate ointment for the treatment of chronic anal fissure: results of a placebo-controlled trial and long-term follow-up.

  Kennedy ML, Sowter S, Nguyen H, Lubowski DZ. Kennedy ML, et al. Dis Colon Rectum. 1999 Aug;42(8):1000-6. doi: 10.1007/BF02236691. Dis Colon Rectum. 1999. PMID: 10458121 Clinical Trial.
• Treatment of chronic anal fissure with topical glyceryl trinitrate.

  Dorfman G, Levitt M, Platell C. Dorfman G, et al. Dis Colon Rectum. 1999 Aug;42(8):1007-10. doi: 10.1007/BF02236692. Dis Colon Rectum. 1999. PMID: 10458122
• Therapeutic effects of different doses of botulinum toxin in chronic anal fissure.

  Mínguez M, Melo F, Espí A, García-Granero E, Mora F, Lledó S, Benages A. Mínguez M, et al. Dis Colon Rectum. 1999 Aug;42(8):1016-21. doi: 10.1007/BF02236694. Dis Colon Rectum. 1999. PMID: 10458124 Clinical Trial.