Competing risk model to determine the prognostic factors and treatment strategies for elderly patients with glioblastoma oleh Zhuo-yi Liu, Song-shan Feng, Yi-hao Zhang, Li-yang Zhang, Sheng-chao Xu, Jing Li, Hui Cao, Jun Huang, Fan Fan, Li Cheng, Jun-yi Jiang, Quan Cheng, Zhi-xiong Liu