1. Key Laboratory of Additive Manufacturing and Applications in Universities of Shandong, Shandong Engineering Research Center for Additive Manufacturing, Qingdao University of Technology, Qingdao 266520, China
2. Department of Spinal Surgery, The Affilliated Hospital of Qingdao University, Qingdao 266003, China
3. Xi'an Jiaotong University, Xi'an 710049, China
4. Beijing Key Lab of CryoBiomedical Engineering and Key Lab of Cryogenics, Technical Institute of Physics and Chemistry Chinese Academy of Sciences, Beijing 100190, China