Ucel Cayhan, D.; Akif Ustuner, M.; Parlak, I. Comparision of Ultrasonography With Direct Radiography and Aspiration for the Confirmation of Nasogastric Tube Placement Among Intubated Patients in the Emergency Servise: A prospective,single-blind,cross-Sectional Study. annalsmedres 2021, 28, 0542-0546.