Author Contributions: Dr Cheng had full access to all of the data in the study and takes responsibility for the integrity of the data and the accuracy of the data analysis.
Study concept and design: Cheng, Fan.
Acquisition of data: Cheng, Liu, Fan, Wang, Zhang, Yi.
Analysis and interpretation of data: Cheng, Jia.
Drafting of the manuscript: Cheng, Jia, Liu, Fan, Wang, Zhang, Yi.
Critical revision of the manuscript for important intellectual content: Cheng, Jia, Liu, Wang.
Statistical analysis: Jia.
Administrative, technical, or material support: Cheng, Liu, Fan, Wang, Zhang, Yi.
Study supervision: Cheng.
Financial Disclosures: None reported.
Additional Contributions: We thank the following individuals from the Department of Gastroenterology, Qilu Hospital, Shandong University: Yanqing Li, PhD, MD, and Xuefeng Lu, MD, for their advice and comments; Ning Zhong, PhD, MD, Tao Zhou, PhD, MD, and Yanjing Gao, PhD, MD, for technical work; and Xiaoli Jia, MD, Zhimin Wang, MD, and Min Li, MD, for their contributions to care or referral of patients and acquisition.