1. Shandong Provincial Key Laboratory of Oral Tissue Regeneration, School of Stomatology, Shandong University, Jinan, Shandong 250012, People's Republic of China
2. Department of Microbiology, Key Laboratory for Experimental Teratology of Chinese Ministry of Education, School of Medicine, Shandong University, Jinan, Shandong 250012, People's Republic of China
3. Shanghai Southwest Weiyu Middle School, Shanghai 200233, People's Republic of China
4. Laboratory of Oral Tumor Biology, Shanghai Research Institute of Stomatology Ninth People Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200011, People's Republic of China
5. Department of Periodontology, School of Stomatology, Shandong University, Jinan, Shandong 250012, People's Republic of China