1. Orthodontic Department, School of Stomatology, Lanzhou University, Lanzhou, China
2. Department of Orthodontics and Dentofacial Orthopedics, Faculty of Dentistry, Ibb University, Ibb, Republic of Yemen
3. Division of Orthodontics and Dentofacial Orthopedics, Department of Preventive Dental Sciences, Faculty of Dentistry, Jazan University, Jazan, Saudi Arabia
4. Department of Orthodontics, Hubei-most Klos & Klobm, School & Hospital of Stomatology, Wuhan University, Wuhan, China
5. Department of Orthodontics, West China School of Stomatology, Sichuan University, Chengdu, China
6. Department of Orthodontics,School and Hospital of Stomatology, China Medical University, Shenyang, China