Comparison of the treatment efficacy between tigecycline plus high-dose cefoperazone-sulbactam and tigecycline monotherapy against ventilator-associated pneumonia caused by extensively drug-resistant Acinetobacter baumannii - Qin, Y; Zhang, J; Wu, L; Zhang, D; Fu, L; Xue, X (Int J Clin Pharmacol Ther, 2018)