Impact of thoracic radiation therapy after chemotherapy on survival in extensive‐stage small cell lung cancer: A propensity score‐matched analysis oleh Lei Deng, ZongMei Zhou, ZeFen Xiao, DongFu Chen, QinFu Feng, Jun Liang, JiMa Lv, XiaoZhen Wang, Nan Bi, Xin Wang, Tao Zhang, WenQing Wang, LvHua Wang