1. Department of Stomatology; Qilu Hospital and Institute of Stomatology; Shandong University; Jinan Shandong China
2. Department of Cadre Health Care; Qilu Hospital of Shandong University; Jinan Shandong China
3. Department of Pathology; Medical College of Qingdao University; Qingdao Shandong China
4. Institute of Basic Medical Science; Qilu Hospital of Shandong University; Jinan Shandong China