Metabolic Changes After Bronchoscopic Lung Volume Reduction With Endobronchial Valves in COPD Patients Marieke C. van der Molen; Rein Posthuma; Anouk W. Vaes; Martijn A. Spruit; Harry R. Gosker; Alain R. Viddeleer; Tineke P. Willems; Lowie E.G.W. Vanfleteren; Dirk-Jan Slebos; Jorine E. Hartman;