1. School and Hospital of Stomatology, Shandong University, Jinan 250012, China
2. Department of Stomatology, Zibo Central Hospital affiliated to Shandong University, Zibo 255000, China
3. Department of Breast and Thyroid Surgery, Zibo Central Hospital affiliated to Shandong University, Zibo 255000, China
4. Department of Stomatology, Qilu Hospital of Shandong University, Jinan 250012, China