1. State Key Laboratory of Oral Disease, West China Hospital of Stomatology, Sichuan University, Chengdu, China
2. Department of Periodontics, School of Dental Medicine, University of Pennsylvania, Philadelphia, PA, USA
3. Department of Periodontology, Peking University School and Hospital of Stomatology, Beijing, China
4. Department of Oral and Maxillofacial Surgery, Peking University School and Hospital of Stomatology, Beijing, China
5. Shanxi Province People’s Hospital, Taiyuan, China
6. Department of Diagnosis and Surgery, School of Dentistry at Araraquara–UNESP, Araraquara, Brazil