Validation of an Oral Disease Severity Score for use in oral lichen planus. (1st June 2022) - Ormond, Martyn; McParland, Helen; Thakrar, Priya; Donaldson, Ana; Andiappan, Manoharan; Cook, Richard J.; Escudier, Michael; Higham, Jon; Hullah, Esther; McMillan, Roddy; Taylor, Jennifer; Shirlaw, Pepe J.; et al.