Corrigendum: Progression-free survival and time to progression as potential surrogate endpoints for overall survival in chemoradiotherapy trials in limited-stage small-cell lung cancer: A systematic review and meta-analysis - Yang, Yin; Wang, Jianyang; Wang, Wenqing; Zhang, Tao; Zhao, Jingjing; Wang, Yu; Li, Yexiong; Wang, Luhua; Bi, Nan (Frontiers in Oncology, 2022)