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 . Ann Med Res . 2021;28(3):0542-0546. Accessed April 4, 2025. http://annalsmedres.org/index.php/aomr/article/view/425