Three cases report of idiopathic angiosarcoma of the head and neck and literature review - Jiang, Hong-Zhi; Jin, Xian-Hua; Huang, Xin-Yi; Dong, Tian-Tian; Zhang, Hong-Jing; Liu, Xiao-Han; Xia, Jian-Xin (Annals of Palliative Medicine, 2020)