1. Faculty of Dentistry, PHENIKAA University , Yen Nghia, Ha Dong, Hanoi 12116 , Vietnam
2. Department of Orthodontics and Pedodontics, Faculty of Dentistry , Van Lang University, 69/68 Dang Thuy Tram, Ward 13, Binh Thanh District, Ho Chi Minh City, 70000, Vietnam
3. Faculty of Dentistry , Department of Orthodontics, , No. 55, St. 180 Phnom Penh, 12211 , Cambodia
4. University of Puthisastra , Department of Orthodontics, , No. 55, St. 180 Phnom Penh, 12211 , Cambodia