A. C. Mafla-Chamorro, N. A. Luna-Jaramillo, A. X. Santacruz-Insuasty, and B. D. Palacios-Córdoba, “Prevalence of chronic apical periodontitis in endodontically treated teeth in the academic community at Universidad Cooperativa de Colombia, Pasto, 2008”, Rev Fac Odontol Univ Antioq, vol. 21, no. 1, pp. 42–49, Dec. 2009.