A prospective, double-blind, randomized, controlled clinical trial in the gingivitis prevention with an oligomeric proanthocyanidin nutritional supplement - Díaz Sánchez, R M; Castillo-Dalí, G; Fernández-Olavarría, A; Mosquera-Pérez, R; Delgado-Muñoz, J M; Gutiérrez-Pérez, J L; Torres-Lagares, D (Mediators Inflamm, 2017)