Comparison of surgical difficulty in patients with resectable non-small cell lung cancer under different neoadjuvant treatment modes: a retrospective cohort study - Zhang, Fan; Qiu, Bin; Ji, Ying; Guo, Wei; Li, Ning; Xue, Qi; Gao, Shugeng; He, Jie (Journal of Thoracic Disease; Vol 13, No 10 (October 31, 2021): Journal of Thoracic Disease, 2021)