Kırkıl, C.; Aygen, E.; DOĞRU, O.; İlhan, Y. S.; Ayten, R.; CAMCI, C.; GÖĞEBAKAN, Özkan. The Efficiency of Various Doses of Topical Isosorbide Dinitrate in the Treatment of Chronic Anal Fissure and the Long-Term Results: A Prospective, Randomized and Controlled Clinical Trial. Turkish Journal of Gastroenterology 2012, 23, 28-32.