00412nam a22001457a 4500 SGT 617.632 T20B BHARDWAJ, AMIT TO DEFERMINE AND CORRELATE THE CHRONIC PERIODONTITIS STATUS AND BLOOD GROUPS IN TWO MAJOR ETHNIC GROUPS OF INDIAN POPULATION SGTU SGTU 2020 70 PERIODONTOLOGY PH.D. DENTAL ddc TH 23990 23990