1. Department of Cardio-Thoracic Surgery, Xiangyang No.1 People’s Hospital, Hubei University of Medicine, Xiangyang, Hubei province, P.R.C.
2. Department of Respiratory Medicine, Xiangyang Central Hospital, Affiliated Hospital of Hubei University of Arts and Science, Xiangyang, Hubei province, P.R.C.
3. Department of Obstetrics and Gynaecology, Xiangyang No.1 People’s Hospital, Hubei University of Medicine, Xiangyang, Hubei province, P.R.C.
4. Department of Oncology, Xiangyang No.1 People's Hospital, Hubei University of Medicine, Xiangyang, Hubei Province, P.R.C.