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DESCRIBE <http://research.tib.eu/covid-19/entity/American%20academy%20of%20periodontology%20and%20european%20federation%20of%20periodontology%202017%20classification%20of%20periodontal%20and%20peri-implant%20diseases%20and%20conditions%20localized%20periodontitis%20stage%202%20grade%20b>
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