1. Department of Mechanical Engineering, University of Texas at El Paso, El Paso, TX, USA
2. Beijing Translational Engineering Center for 3D printer in Clinical Neuroscience, Department of Neurosurgery, Beijing Tiantan Hospital, Capital Medical University, Beijing, China
3. Multidisciplinary Research Center, Shantou University, Shantou, China
4. School of Bioscience & Bioengineering, South China University of Technology, Guangzhou, China
5. Department of Neurosurgery, University Medical Centre Mainz, Johannes Gutenberg University of Mainz, Mainz, Germany
6. Bio-manufacturing Center, Department of Mechanical Engineering, Tsinghua University, Beijing, China