Salivary antioxidant enzymes and lipid peroxidation product malondialdehyde and sialic acid levels among smokers and non-smokers with chronic periodontitis—A clinico-biochemical st... oleh C Naresh Kumar, Subramaniam M Rao, Prashanth R Shetty, V Ranganath, Abhilasha S Patil, Anu Anna John