1. School and Hospital of Stomatology, Shandong University & Shandong Key Laboratory of Oral Tissue Regeneration & Shandong Engineering Laboratory for Dental Materials and Oral Tissue Regeneration, Jinan, Shandong, China.
2. Sichuan University, West China Hospital of Stomatology, Department of Orthodontontics, State Key Laboratory of Oral Disease, National Clinical Research Centre of Oral Disease, Chengdu, China.
3. Department of Stomatology, Haiyuan College of Kunming Medical University, Kunming, China.