1. State Key Laboratory of Military Stomatology & National Clinical Research Center for Oral Diseases & Shaanxi Key Laboratory of Stomatology, Department of Pediatric Dentistry, School of Stomatology, Fourth Military Medical University, Xi’an, China
2. Department of Orthodontics, College of Stomatology, Xi’an Jiaotong University, China
3. Department of Stomatology, The General Hospital of Tibetan Military Region, China