Design and development of a 3D-printed model and training system for endoscopic hypertensive cerebral hemorrhage evacuation surgeryZHU Jun-Hao1,TANG Chao1,YUAN Feng1,DU Chao-Nan1,CAI Xiang-Ming2,CONG Zi-Xiang1,YANG Jin1,GENG Yuan-Ming3,ALI Alleyar3,MA Chi-Yuan1