1. Department of Pediatric Dentistry, School and Hospital of Stomatology, Peking University, #22 Zhongguancun Nandajie, Haidian District, Beijing 100081, China
2. Department of Chemical Engineering and Materials Science, Michigan State University, East Lansing, Michigan 48824, United States
3. College of Dentistry and Biomedical Engineering, Toxicology, Pharmacy/Nutrition, Anatomy and Cell Biology Colleges Graduate Programs, University of Saskatchewan, Saskatoon, Canada