1. Department of Periodontology, School and Hospital of Stomatology, Cheeloo College of Medicine, Shandong University & Shandong Key Laboratory of Oral Tissue Regeneration & Shandong Engineering Laboratory for Dental Materials and Oral Tissue Regeneration
2. Medical Research Center, The Affiliated Hospital of Qingdao University
3. Department of Periodontology, The Affiliated Hospital of Qingdao University