1. Department of Geriatric Dentistry, Beijing Laboratory of Biomedical Materials, Peking University School and Hospital of Stomatology, Beijing 100081, China
2. Biomedical Engineering Department, Peking University, Beijing 100191, China
3. Peking University International Cancer Institute, Beijing 100191, China
4. Peking University-Yunnan Baiyao International Medical Research Center, Beijing 100191, China
5. Institute of Medical Technology, Health Science Center of Peking University, Beijing 100191, China