Free gingival graft and acellular dermal matrix for gingival augmentation: a 15-year clinical study - Cevallos, Cecilia Amparo Reyes; Resende, Daniel Romeu Benchimol de; Damante, Carla Andreotti; Sant’Ana, Adriana Campos Passanezi; Rezende, Maria Lúcia Rubo de; Greghi, Sebastião Luiz Aguiar; Zangrando, Mariana Schützer Ragghianti (Clinical Oral Investigations, 2020)