RETRACTION: Cancer-derived exosomal miR-221-3p promotes angiogenesis by targeting THBS2 in cervical squamous cell carcinoma (Retraction of Vol 22, Pg 397, 2019)Wu, Xiang-Guang; Zhou, Chen-Fei; Zhang, Yan-Mei; Yan, Rui-Ming; Wei, Wen-Fei; Chen, Xiao-Jing; Yi, Hong-Yan; Liang, Luo-Jiao; Fan, Liang-sheng; Liang, Li; Wu, Sha*; Wang, Wei*Science Citation Index Expanded广州医学院; 南方医科大学; 1摘要-关键词-