Risk factors of multidrug-resistant, extensively drug-resistant and pandrug-resistant Acinetobacter baumannii ventilator-associated pneumonia in a Medical Intensive Care Unit of University Hospital in Thailand - Inchai, J; Liwsrisakun, C; Theerakittikul, T; Chaiwarith, R; Khositsakulchai, W; Pothirat, C (J Infect Chemother, 2015)