Local injection of CCL19-expressing mesenchymal stem cells augments the therapeutic efficacy of anti-PD-L1 antibody by promoting infiltration of immune cells ============================================================================================================================================================= * Yuichi Iida * Rintaro Yoshikawa * Akihiko Murata * Hitoshi Kotani * Yasuhiro Kazuki * Mitsuo Oshimura * Yumi Matsuzaki * Mamoru Harada