[Guo, Junchen; Xu, Xianghua; Chen, Yongyi] Hunan Canc Hosp, Dept Palliat care, 283 Tongzipo Rd, Changsha 410006, Hunan, Peoples R China.
[Guo, Junchen; Gong, Youwen] Univ South China, Sch Nursing, 28 Changsheng West Rd, Hengyang 421001, Hunan, Peoples R China.
[Dai, Yunyun] Univ Wollongong, Hlth Serv Res Inst, Northfields Ave, Wollongong, NSW 2522, Australia.
[Gong, Youwen] First Peoples Hosp Changde City, Dept Nursing, Changde, Peoples R China.