[Xing, Qiuyan; Sun, Xiaohui] Guangdong Med Univ, Sch Nursing, Dongguan, Peoples R China.
[Tang, Li'an] Guangxi Med Univ, Dept Resp & Crit Care Med, Affiliated Hosp 1, Nanning, Peoples R China.
[Wang, Rong] Univ South China, Sch Nursing, Hengyang, Peoples R China.
[Chen, Rui] Southern Theater Command, Hosp 1, Dept Orthoped, Zhanjiang, Peoples R China.
[Wu, Tianxiu] Guangdong Med Univ, Sch Basic Med, Zhanjiang, Peoples R China.