Endoscopic lung volume reduction with endobronchial valves in very low DLCO patients: results from the German Registry – Lungenemphysemregister e.V. oleh Pavlina Lenga, Christoph Ruwwe-Glösenkamp, Christian Grah, Joachim Pfannschmidt, Jens Rückert, Stephan Eggeling, Sven Gläser, Bernd Schmidt, Paul Schneider, Sylke Kurz, Gunda Leschber, Andreas Gebhardt, Birgit Becke, Olaf Schega, Jakob Borchardt, Ralf-Harto Hübner