1. Department of Rheumatology, Shouguang People’s Hospital, Shouguang, Shandong, P.R. China
2. Trauma orthopedics, The No. 4 hospital of Jinan, Jinan, Shandong, P.R. China
3. School of Nursing, Hunan University of Medicine, Huaihua, Hunan, P.R. China
4. Department of Teaching Supervision and Evaluation, JILin Medical University, Jilin, Jilin, P.R. China