1. West China Hospital of Stomatology, Sichuan University, State Key Laboratory of Oral Diseases; Department of Head and Neck Oncology; No. 14, Section Three, Ren Min Nan Road Chengdu Sichuan China 610041
2. Nan Chong Central Hospital, Second Clinical Medical College of Chuan Bei Medical College; Department of Stomatology; No. 66 , Da Bei Jie Road Nanchong Sichuan China 637000
3. West China Hospital of Stomatology, Sichuan University, State Key Laboratory of Oral Diseases; Department of Oral and Maxillofacial Surgery; No. 14, Section Three, Ren Min Nan Road Chengdu Sichuan China 610041
4. West China Hospital, Sichuan University; Department of Cardiovascular Disease; No 37, Guo Xue Xiang Chengdu Sichuan China 610041
5. West China Hospital of Stomatology, Sichuan University, State Key Laboratory of Oral Diseases; Department of Periodontology; No. 14, Section Three, Ren Min Nan Road Chengdu Sichuan China 610041
6. School of Dentistry, The University of Manchester; Cochrane Oral Health Group; Coupland 3 Building, Oxford Road Manchester UK M13 9PL