Efficacy and safety of adjunctive nebulized colistin sulfate for multidrug-resistant Gram-negative bacteria pneumonia: a retrospective comparative cohort study - Bao, Xiao-Li; Tao, Tao; Tang, Nan; Wang, Yang-Zhong; Liao, Xiu-Qing; Huang, Li-Li; Ji, Jin-Jin; Chen, Xia (Annals of Palliative Medicine, 2022)