Exploratory analysis of immunochemotherapy compared to chemotherapy after EGFR‐TKI in non–small cell lung cancer patients with EGFR mutation: A multicenter retrospective study oleh Tae Hata, Chikara Sakaguchi, Keita Hirano, Hiroshi Kobe, Masaki Ishida, Takayuki Nakano, Yusuke Tachibana, Nobuyo Tamiya, Shinsuke Shiotsu, Takayuki Takeda, Tadaaki Yamada, Toshihide Yokoyama, Michiko Tsuchiya, Yukio Nagasaka