Efficacy, safety, and therapeutic drug monitoring of polymyxin B sulfate and colistin sulfate in critically ill patients: a real-world retrospective study - Zhang, Yijing; Wang, Chuhui; Chen, Jiaojiao; Bai, Chuqi; Sun, Dan; Qiu, Yulan; Teng, Mengmeng; Dong, Yalin (Frontiers in Pharmacology, 2025)