1. Department of Immunology and Infectious Diseases, The Forsyth Institute, Cambridge, Massachusetts, USA
2. Department of Stomatology, Shengjing Hospital of China Medical University, Shenyang, Liaoning Province, China
3. Department of Periodontology, Peking University School of Stomatology and Hospital of Stomatology, Beijing, China
4. Department of Stomatology, Fourth College of Harbin Medical University, Harbin, China