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“COMPARISON OF PERIODONTAL STATUS AMONG MILD, MODERATE AND HEAVY SMOKERS IN FACULTY OF DENTISTRY, UNIVERSITAS SUMATERA UTARA: PERBANDINGAN STATUS PERIODONTAL PADA PEROKOK RINGAN, SEDANG DAN BERAT DI FAKULTAS KEDOKTERAN GIGI UNIVERSITAS SUMATERA UTARA”, Dentika Dental J., vol. 20, no. 2, pp. 57–61, Dec. 2017, doi: 10.32734/dentika.v20i2.996.