[Wan, Yanping; Yan, Wenjing; Wang, Dian; Zeng, Guqing; Tan, Xing] Univ South China, Sch Nursing, 28 Changsheng Rd West, Hengyang, Hunan, Peoples R China.
[Xiong, Haihan; Tan, Xing] Peoples Hosp Longhua Dist, Shenzhen, Peoples R China.
[Gui, Sijie] Nanchang Univ, Queen Mary Sch, Nanchang, Jiangxi, Peoples R China.
[Tong, Lingling] Cent S Univ, Sch Publ Hlth, Dept Epidemiol & Hlth Stat, Changsha, Hunan, Peoples R China.