1. Department of Periodontology, Faculty of Dentistry, Hacettepe University, Ankara, Turkey.
2. Department of Plastic Reconstructive and Aesthetic Surgery, Faculty of Medicine, Hacettepe University, Ankara, Turkey.
3. Department of Comprehensive Care, School of Dental Medicine, Case Western Reserve University, Cleveland, Ohio.
4. Department of Periodontics, College of Dentistry, University of Illinois at Chicago, Chicago, Ill.