High expression of Dll4 and CD44V6 is associated with clinicopathological characteristics and poor prognosis in osteosarcoma patients - Xie, Haiyang; Wang, Ye; Yu, Ting; Jiang, Cheng; Wei, Peng; Zhang, Yingbo (Translational Cancer Research; Vol 10, No 2 (February 26, 2021): Translational Cancer Research, 2021)