1. Department of Respiratory Diseases, The First Affiliated Hospital of Soochow University, Suzhou, China.
2. Department of Gastroenterology, Xiangcheng People's Hospital, Suzhou, China.
3. Department of Oncology, The First Affiliated Hospital of Soochow University, Suzhou, China.
4. Department of Radiation Oncology, The First People's Hospital of Nantong, Nantong, China.