1. Department of Cardiology and Endodontology & National Clinical Research Center for Oral Disease School and Hospital of Stomatology Peking University Beijing P. R. China
2. Department of Geriatric Dentistry School and Hospital of Stomatology Peking University Beijing P. R. China
3. Laboratory of Biomanufacturing and Food Engineering Institute of Food Science and Technology, Chinese Academy of Agricultural Sciences Beijing P. R. China