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Al-Ahmad A, Roth D, Wolkewitz M, Wiedmann-Al-Ahmad M, Follo M, Ratka-Krüger P, Deimling D, Hellwig E, Hannig C.Al-Ahmad A, et al.Clin Oral Investig. 2010 Aug;14(4):391-6. doi: 10.1007/s00784-009-0318-9. Epub 2009 Jul 22.Clin Oral Investig. 2010.PMID: 19626350