1 Hospital of Stomatology, Sun Yat-sen University, Guangzhou, Guangdong, China.
2 Guangdong Provincial Key Laboratory of Stomatology, Sun Yat-sen University, Guangzhou, Guangdong, China.
3 Qingdao Hospital, University of Health and Rehabilitation Sciences, Qingdao, Shandong, China.
4 Department of Preventive Dentistry, Academic Center for Dentistry Amsterdam (ACTA), University of Amsterdam and VU University Amsterdam, Amsterdam, Netherlands.