1. School of Clinical Medicine, Weifang Medical University, Weifang, P. R. China
2. School of Psychology, Weifang Medical University, Weifang Shandong, P. R. China
3. Clinical Competency Training Center, Medical Experiment and Training Center, Weifang Medical University, Weifang Shandong, P. R. China
4. Department of Physical Education, School of Foundation Medical, Weifang Medical University, Weifang, P. R. China
5. Department of Bioscience and Technology, Weifang Medical University, Weifang, Shandong, P. R. China
6. School of Practical Teaching Management Department, Weifang Medical University, Weifang Shandong, P. R. China.