1 Department of Gastroenterology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China; State Key Laboratory of Esophageal Cancer Prevention and Treatment, Zhengzhou University, Zhengzhou, China.
2 Department of Thyroid Surgery, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China.
3 Department of Gastroenterology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China.