1. Department of Respiratory Medicine, Huai'an Second People's Hospital The Affiliated Huai'an Hospital of Xuzhou Medical University Huai'an China
2. Gastroenterology Department, Nanjing Pukou District Central Hospital Pukou Branch of Jiangsu People's Hospital Nanjing China
3. Department of Ultrasound Northern Jiangsu People's Hospital Yangzhou China
4. Department of Respiratory Medicine Hongze District People's Hospital Huai'an China