1. Department of Neurosurgery; Third Affiliated Hospital; Sun Yat-sen University; Guangzhou China
2. Bio-Manufacturing Center; Department of Mechanical Engineering; Tsinghua University; Beijing China
3. School of Bioscience & Bioengineering; South China University of Technology; Guangzhou China
4. Department of Neurosurgery; Zhujiang Hospital; South Medical University; Guangzhou China
5. National Engineering Research Center for Biomaterials; Sichuan University; Chengdu China
6. Department of Neurosurgery; University Medical Centre Mainz; Johannes Gutenberg University of Mainz; Mainz Germany