1. School of Nursing and Rehabilitation, Shandong University, Jinan, Shandong, China
2. School of Nursing, Purdue University, West Lafayette, Indiana
3. Yantai Yuhuangding Hospital, Yantai, Shandong, China
4. Linyi Central Hospital, Linyi, Shandong, China
5. People's Hospital of Rizhao, Rizhao, Shandong, China