A systematic review and meta-analysis of ventilator associated pneumonia in adults in Asia; an analysis of national income level on incidence and etiology by Bonell, A, Azarrafiy, R, Huong, VTL, Viet, TL, Phu, VD, Dat, VQ, Wertheim, H, Van Doorn, HR, Lewycka, S, Nadjm, B