1. Department of Gastroenterology, The First Affiliated Hospital of Shantou University Medical College, Shantou, Guangdong, China (mainland)
2. Department of Pathology, The Second People’s Hospital of Shenzhen, Shenzhen, Guangdong, China (mainland)
3. Department of Gastroenterology, The Second People’s Hospital of Shenzhen, Shenzhen, Guangdong, China (mainland)