1. Department of Medical Oncology, Cancer Center, State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, People's Republic of China.
2. Department of Palliative Medicine, West China Fourth Hospital, Sichuan University, Chengdu, People's Republic of China.
3. Dehong Hospice, Dehong People's Hospital, Yunnan, People's Republic of China.