Association of salivary levels of the bone remodelling regulators sRANKL and OPG with periodontal clinical status - Tobón-Arroyave, S I; Isaza-Guzmán, D M; Restrepo-Cadavid, E M; Zapata-Molina, S M; Martínez-Pabón, M C (J Clin Periodontol, 2012)