1. Department of Diagnosis and Surgery; School of Dentistry at Araraquara; São Paulo State University - UNESP; Araraquara SP Brazil
2. Department of Periodontics; University of Pennsylvania School of Dental Medicine; Philadelphia PA USA
3. Department of Periodontology; University of North Carolina at Chapel Hill School of Dentistry; Chapel Hill NC USA
4. Department of Morphology; School of Dentistry at Araraquara; São Paulo State University - UNESP; Araraquara SP Brazil