Shyagali, Tarulatha, Mohamed Helmy Salama, and Deepak Bhayya. 2017. “Prevalence of Tobacco Usage and Its Effect on the Periodontal Health Parameters in the Mining Employees and the General Population- A Comparative Study”. Brazilian Journal of Oral Sciences 16 (December). Limeira, SP:1-9. https://doi.org/10.20396/bjos.v16i0.8650489.