1. Key Laboratory of High Efficiency and Clean Mechanical Manufacture of Ministry of Education, School of Mechanical Engineering, Shandong University, Jinan 250061, P. R. China
2. Key National Demonstration Center for Experimental Mechanical Engineering Education, Shandong University, Jinan 250061, P. R. China
3. Qilu Hospital of Shandong University, Jinan 250012, P. R. China