1. Department of Stomatology; General Hospital; Tianjin Medical University; Tianjin China
2. Guanghua School of Stomatology; Hospital of Stomotology; Sun Yat-sen University Guangdong Provincial Key Laboratory of Stomatology; Guangzhou China
3. Plastic surgery Section; Tianjin Police Hospital; Tianjin China
4. School of Public Health; Tianjin Medical University; Tianjin China
5. School of Dentistry; Hospital of Stomatology; Tianjin Medical University; Tianjin China