RETRACTED: Corrigendum: Combination of Tanshinone IIA and Cisplatin Inhibits Esophageal Cancer by Downregulating NF-κB/COX-2/VEGF Pathway - Liao, Xiaozhong; Gao, Ying; Liu, Jiahui; Tao, Lanting; Wang, Dongmei; Xie, Dan; Mo, Suilin (Frontiers in Oncology, 2021)