1. Department of Clinical Medicine, Weifang Medical University, Weifang, Shandong 261053, P.R. China
2. Department of Nursing, Weifang Medical University, Weifang, Shandong 261053, P.R. China
3. Department of Pathology, Linyi People's Hospital, Linyi, Shandong 276000, P.R. China
4. Department of Urology, Linyi People's Hospital, Linyi, Shandong 276000, P.R. China