1. Shandong Provincial Key Laboratory of Oral Tissue Regeneration, School of Stomatology Shandong University Jinan China
2. Department of Orthodontics, School of Stomatology Shandong University Jinan China
3. Department of Stomatology The 5th People's Hospital of Ji'nan Jinan China
4. Department of Orthodontics, Division of Growth and Development, School of Dentistry University of California Los Angeles CA USA
5. UCLA Division of Plastic and Reconstructive Surgery and Department of Orthopaedic Surgery and the Orthopaedic Hospital Research Center University of California Los Angeles CA USA