The Effect of Cigarette Smoking on the Severity of Periodontal Disease Among Older Thai Adults von Torrungruang, Kitti, Nisapakultorn, Kanokwan, Sutdhibhisal, Sanutm, Tamsailom, Suphot, Rojanasomsith, Kaesarin, Vanichjakvong, Ornanong, Prapakamol, Suvapa, Premsirinirund, Thirapat, Pusiri, Thitima, Jaratkulangkoon, Orawan, Kusump, Sakda, Rajatanavin, Rajata

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