1. Department of Periodontology; Faculty of Dentistry; Hacettepe University; Ankara Turkey
2. Department of Dentomaxillofacial Radiology; Faculty of Dentistry; Hacettepe University; Ankara Turkey
3. Department of Pediatric Immunology; Faculty of Medicine; Hacettepe University; Ankara Turkey
4. Department of Biostatistics; Faculty of Medicine; Hacettepe University; Ankara Turkey