[1] Nanjing Med Univ, Womens Hosp, Nanjing Matern & Child Hlth Care Hosp, Nanjing 210004, Peoples R China
[2] Nanjing Med Univ, Sch Nursing, Nanjing 211166, Peoples R China
[3] Univ Surrey, Sch Hlth & Sci, Fac Hlth & Med Sci, Guildford GU2 7XH, England
[4] Nanjing Med Univ, Affiliated Hosp 1, Geriatr Dept, Nanjing 210029, Peoples R China
[5] Jiangsu Nursing Assoc, Nanjing 210008, Peoples R China
[6] Xuzhou Med Univ, Affiliated Hosp, Oncol Dept, Xuzhou 221002, Peoples R China