Colistin sulfate versus polymyxin B for the treatment of infections caused by carbapenem-resistant Acinetobacter baumannii: a multicenter retrospective cohort study - Hongmei Liu; Li Tang; Liang Zheng; Yuanyuan Fu; Mingjiang Qian; Canghong Ouyang; Na Tao; Shuiping Ou; Yong He (Frontiers in Pharmacology, 2025)