Author Correction: Periodontal evaluation of palatally impacted maxillary canines treated by closed approach with ultrasonic surgery and orthodontic treatment: a retrospective pilot study - Camilla Grenga; Rosanna Guarnieri; Vittorio Grenga; Mauro Bovi; Serena Bertoldo; Gabriella Galluccio; Roberto Di Giorgio; Ersilia Barbato (Scientific Reports, 2021)