1 Department of Stomatology, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, Beijing, 100045, China.
2 Department of Pathology, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, Beijing, 100045, China.
3 Department of Stomatology, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, Beijing, 100045, China. Electronic address: [email protected].