1. Department of Radiology, School of Medicine, University of Phayao, Phayao, Thailand
2. Department of Anatomy, School of Medical Sciences, University of Phayao, Phayao, Thailand
3. Department of Orthodontics, School of Dentistry, University of Phayao, Phayao, Thailand
4. Department of Preventive Dentistry, Faculty of Dentistry, Prince of Songkla University, Songkhla, Thailand