1. Department of Respiratory Diseases, Suzhou Municipal Hospital, Suzhou, China.
2. Department of Gastroenterology, Xiangcheng People's Hospital, Suzhou, China.
3. Department of Respiratory Diseases and The First Affiliated Hospital of Soochow University, Suzhou, China.
4. Department of Thoracic Surgery, The First Affiliated Hospital of Soochow University, Suzhou, China.