1. The First Affiliated Hospital, Xi'an Jiaotong University College of Medicine, Xi'an, China 2School of Public Health, Xi'an Jiaotong University Health Science Center, Xi'an, China
2. The First Affiliated Hospital, Xi'an Jiaotong University College of Medicine, Xi'an, China
3. National Clinical Research Center of Digestive Diseases, Beijing Friendship Hospital, Capital Medical University, Beijing, China
4. The School of Life Science and Technology, Xi'an Jiaotong University, Xi'an, China
5. School of Public Health, Xi'an Jiaotong University Health Science Center, Xi'an, China
6. Xi'an International University, Xi'an, China
7. School of Public Health, Xi'an Jiaotong University Health Science Center, Xi'an, China 6Key Laboratory of Environment and Genes Related to Diseases (Xi'an Jiaotong University), Ministry of Education of China, Xi'an, China