Department of Stomatology Center, Shenzhen Hospital, Southern Medical University, Shenzhen, Guangdong, P. R. China

Department of Stomatology, Northwest Women's and Children's Hospital, Xi'an, Shaanxi, P. R. China

State Key Laboratory of Military Stomatology & National Clinical Research Center for Oral Diseases & Shaanxi Engineering Research Center for Dental Materials and Advanced Manufacture, Department of Periodontology, School of Stomatology, Fourth Military Medical University, Shaanxi, P. R. China

These authors contributed equally to this work.