1. Department of Gastroenterology, Beijing Friendship Hospital, Beijing Key Laboratory for Precancerous Lesion of Digestive Disease National Clinical Research Center for Digestive Disease, Beijing Digestive Disease Center, Capital Medical University Beijing China
2. Department of International Medical Services Peking Union Medical College Hospital, Chinese Academy of Medical Sciences Beijing China
3. Department of Thoracic Surgery Peking Union Medical College Hospital, Chinese Academy of Medical Sciences Beijing China