Addendum: Engineered extracellular vesicles from human periodontal-ligament stem cells increase VEGF/VEGFR2 expression during bone regeneration - Pizzicannella, Jacopo; Gugliandolo, Agnese; Orsini, Tiziana; Fontana, Antonella; Ventrella, Alessia; Mazzon, Emanuela; Bramanti, Placido; Diomede, Francesca; Trubiani, Oriana (Frontiers in Physiology, 2023)