1. Department of Thoracic Surgery, The Third Affiliated Hospital of Kunming Medical University, Yunnan Cancer Hospital, Kunming, Yunnan 650118, P.R. China
2. Department of Palliative Medicine and Palliative Medicine Research Center, The Third Affiliated Hospital of Kunming Medical University, Yunnan Cancer Hospital, Kunming, Yunnan 650118, P.R. China
3. School of Medicine, Yunnan University, Kunming, Yunnan 650091, P.R. China
4. Department of Gynecology, The Third Affiliated Hospital of Kunming Medical University, Yunnan Cancer Center, Kunming, Yunnan 650118, P.R. China