1. Department of Stomatology, The Affiliated Hospital of Qingdao University, No. 16 Jiangsu Road, Shinan District, Qingdao 266000, Shandong, China
2. Department of Stomatology, Qingdao Women and Children’s Hospital. No. 6 Tongfu Road, Shibei District, Qingdao 266000, Shandong, China
3. College of Food Science and Engineering, Qingdao Agricultural University. No. 700 Changcheng Road, Chengyang District, Qingdao 266109, Shandong, China