1. School of Nursing, Shandong University, Jinan, Shandong, China;
2. Department of Health Management, Heze Medical College, Heze, Shandong, China;
3. China Department of Sociology, State University of New York Buffalo State, Buffalo, NY, USA;
4. School of Public Health, Shandong University, Jinan, Shandong, China;
5. School of Foreign Languages and Literature, Shandong University, Jinan, Shandong, China