1. Department of Periodontology, College of Dentistry, University of Sulaimani, Sulaymaniyah, Kurdistan Region, Iraq
2. Faculty of Dentistry, Qaiwan International University, Sulaymaniyah, Kurdistan Region, Iraq
3. Department of Pedodontics, Orthodontics and Preventive Dentistry, College of Dentistry, University of Sulaimani, Sulaymaniyah, Kurdistan Region, Iraq