<prompt> Which of the following is true about Aggressive periodontitisSlow progression, rapid episodes possibleFamilial aggregation is typical feature.Local factors often commensurate with observed periodontal destructionOften found in older patients but can be found in all age groups.  <response>: Classification and Clinical CharacteristicsFeaturesThe 1999 international classification workshop defined the entity of aggressive periodontitis to be characterized by three primary features Table:TABLE Diagnostic Criteria to Distinguish Chronic and Aggressive Periodontitis 