A comparison of culture and PCR methods for identification of Aggregatibacter actinomycetemcomitans isolated from acute necrotizing ulcerative gingivitis oleh Maryam Ramez, Faramarz Masjedian Jazi, Hamed Tavakoli, Abazar Pournajaf, Gholamreza Irajian, Meysam Hasannejad Bibalan, Behzad Emadi, Behrooz Yasini