Corrigendum: Effect of a Topical Nonsteroidal Anti-Inflammatory Drug (0.1% Pranoprofen) on VEGF and COX-2 Expression in Primary Pterygium - Yao, Bangtao; Wang, Fei; Zhao, Xiaogui; Wang, Bei; Yue, Xiaoli; Ding, Yuhua; Liu, Gang (Frontiers in Pharmacology, 2021)