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 - Kırkıl, Cüneyt; Aygen, Erhan; DOĞRU, Osman; İlhan, Yavuz Selim and Ayten, Refik and CAMCI, Cemalettin and GÖĞEBAKAN, Özkan (Turkish Journal of Gastroenterology, 2012)