1. Department of Stomatology, Xiangyang No. 1 People's Hospital, Hubei University of Medicine, Xiangyang, 441053, PR China
2. Department of Stomatology, Xiangyang Central Hospital, Affiliated Hospital of Hubei University of Arts and Science, Xiangyang, 441000, PR China
3. Department of Oral Medicine, Xiangyang Polytechnic, Xiangyang, 441006, PR China
4. Department of Stomatology, The First Affiliated Hospital of Fujian Medical University, Fuzhou, 350001, PR China