González Quesada DDS, MSc, J., and S. Rivera Alvarez DDS. “Pyridinoline (ICTP) Levels in Gingival Crevicular Fluid (GCF) in Chronic Periodontitis”. Odovtos - International Journal of Dental Sciences, vol. 18, no. 3, Oct. 2016, pp. 61-68, doi:10.15517/ijds.v0i0.26497.