Xenogeneic collagen matrix for the treatment of multiple gingival recessions in esthetics areas: a case series with 24-month follow-up - Michel, Raphaella Coelho; Ferreira, Rafael; Carvalho, Érika Beatriz Spada de; Jurkevicz, Talyta Sasaki; Damante, Carla Andreotti; Sant'Ana, Adriana Campos Passanezi (Research, Society and Development, 2021)