1. Department of Ultrasonic Medicine, 3D Printing Research Center, Tang Du Hospital, Air Force Medical University, No. 569 of Xin Si Road, Xi’an, Shaanxi 710038. P. R. China
2. School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi’an, Shaanxi 710129, P. R. China
3. School of Chemical Engineering and Technology, Xi’an Jiaotong University, Xi’an 710049, P. R. China
4. School of Mechanical Engineering, Xi’an Jiaotong University, No. 28, Xian Ning West Road, Xi’an, Shaanxi 710049, P. R. China