Hagmeyer, L.; Theegarten, D.; Treml, M.; Priegnitz, C.; Randerath, W. Validation of Transbronchial Cryobiopsy in Interstitial Lung Disease - Interim Analysis of a Prospective Trial and Critical Review of the Literature. Sarcoidosis Vasc Diffuse Lung Dis 2016, 33 (1), 2-9.