Endobronchial Ultrasound-Guided Transbronchial Needle Aspiration for the Diagnosis of Intrathoracic Lymphadenopathy in Patients with Extrathoracic Malignancy:a Multicenter Study . J Thorac Oncol,2011,6:1505-1509.Utility of Endobronchial Ultrasound-Guided ......