Estimation of salivary matrix metalloproteinase-9 in oral leukoplakia, oral submucous fibrosis, and healthy individuals: a comparative observational study - Thiruvalluvan, Akshaya; R.C. Reddy, Jagat; Sekizhar, Vandana; Subramanyam, Veni; T., Sivasankari; V., Varsha (Journal of Stomatology, 2021)