Circulating tumor cells (CTCs)/circulating tumor endothelial cells (CTECs) and their subtypes in small cell lung cancer: Predictors for response and prognosis oleh Hao‐Hua Zhu, Yu‐Tao Liu, Yu Feng, Li‐Na Zhang, Tong‐Mei Zhang, Gui‐Lan Dong, Pu‐Yuan Xing, Hong‐Yu Wang, Yuan‐Kai Shi, Xing‐Sheng Hu