1. Department of Oral Pathology Peking University School and Hospital of Stomatology Beijing China
2. International VIP Dental Clinic, Tianjin Stomatological Hospital Stomatological Hospital of Nankai University Tianjin China
3. Central Laboratory Peking University School and Hospital of Stomatology Beijing China
4. Department of Oral Pathology, School of Stomatology Kunming Medical University Kunming China