Magnitude of multidrug-resistant and extended-spectrum β-lactamase-producing gram-negative bacteria from tracheal aspirates of intensive care unit patients in Ethiopia - Zenebe Gebreyohannes Berhe; Shambel Araya Haile; Gadissa Bedada Hundie; Ashenafi Alemu Wami; Tesfa Addis; Elias Alehegn; Mahlet Abayneh; Shalom Tsegaye Zergaw; Natnael Dejene Engida; Alganesh Gebreyohanns; Firehiwot Workneh; Tsedale Woldu Hadgu; et al. (PLoS ONE)