[1] Shandong Univ, Sch Nursing & Rehabil, Jinan, Shandong, Peoples R China
[2] Purdue Univ, Sch Nursing, W Lafayette, IN USA
[3] Yantai Yuhuangding Hosp, Dept Nursing, Yantai, Shandong, Peoples R China
[4] Weifang Peoples Hosp, Dept Nursing, Weifang, Shandong, Peoples R China
[5] Shandong Univ, Dept Nursing, Hosp 2, Jinan, Shandong, Peoples R China
[6] Shandong First Med Univ, Dept Nursing, Cent Hosp, Jinan, Shandong, Peoples R China