Adult 1 Aged 1 Biomarkers 1 Case-Control Studies 1 Complement C3c 1 Electrophoresis, Gel, Two-Dimensional 1 Enzyme-Linked Immunosorbent Assay 1 Female 1 Fibrin Fibrinogen Degradation Products 1 Humans 1 Immunoblotting 1 Lichen Planus, Oral 1 Male 1 Mass Spectrometry 1 Middle Aged 1 Oral lichen planus 1 Proteins 1 Proteomics 1 Saliva 1 Salivary Cystatins 1 Salivary proteins 1 adult 1 aged 1 biological marker 1 case control study 1 chemistry 1 complement component C3c 1 cystatin S enzyme linked immunosorbent assay 1 female 1