1. Department of Stomatology, Nanfang Hospital, Southern Medical University, Guangzhou 510515, China
2. College of Stomatology, Southern Medical University, Guangzhou 510515, China
3. International Medical Center, Guangdong Second Provincial General Hospital, Guangzhou 510317, China
4. Department of Stomatology, Guangzhou Women and Children’s Medical Center, Guangzhou Medical University, Guangzhou 510623, China
5. Division of Gastroenterology, Hepatology and Nutrition, Cincinnati Children’s Hospital Medical Center, Cincinnati, Ohio 45229, USA
6. Department of Biochemistry, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou 510080, China