Characterization of initial/early histologic features of proliferative leukoplakia and correlation with malignant transformation: a multicenter study - Alabdulaaly, Lama; Villa, Alessandro; Chen, Tiffany; Kerr, Alexander; Ross, Nicholas; Alves, Fábio Abreu; Guollo, Andre; Woo, Sook-Bin (Modern Pathology, 2022)