1. Key Lab. of Oral Diseases Research of Anhui Province, College & Hospital of Stomatology, Anhui Medical University, Hefei 230032, China
2. School of Dentistry, University of Detroit Mercy, Detroit, Michigan 48208-2576, United States
3. Faculty of Dentistry, The Prince Philip Dental Hospital, The University of Hong Kong, Hong Kong 999077, China
4. Department of Stomatology, Longgang Otorhinolaryngology Hospital, Shenzhen 518172, China