Serkan Güleç1, M Cem Doğan2, Gülşah Seydaoğlu3. 1. Department of Biostatistics, Faculty of Medicine, Çukurova University, Adana, Turkey. sgulec@cu.edu.tr. 2. Department of Pediatric Dentistry, Faculty of Dentistry, Çukurova University, Adana. Turkey. 3. Department of Pediatric Dentistry, Faculty of Dentistry, Çukurova University, Adana.