Cardiopulmonary Exercise Testing Allows Discrimination Between Idiopathic Non-specific Interstitial Pneumonia and Idiopathic Pulmonary Fibrosis in Mild to Moderate Stages of the Disease. - Hagmeyer, Lars; Herkenrath, Simon; Anduleit, Norbert; Treml, Marcel; Randerath, Winfried (Lung (0341-2040), 2019)