[1] Tianjin Med Univ, Sch Nursing, Tianjin 300070, Peoples R China
[2] Emory Univ, NHW Sch Nursing, 1520 Clifton Rd, Atlanta, GA 30322 USA
[3] Tianjin Med Univ, Hosp 2, Dept Oncol, Tianjin, Peoples R China
[4] Tianjin Med Univ, Sch Publ Hlth, Tianjin 300070, Peoples R China