1 Department of Medicine, Pulmonary and Critical Care Medicine, University Medical Center Giessen and Marburg, Philipps-University Marburg 35043, Germany. Electronic address: claus.vogelmeier@med.uni-marburg.de.
2 Centre for Respiratory Medicine and Allergy, Institute of Inflammation and Repair, Manchester Academic Health Science Centre, The University of Manchester, Manchester, UK; University Hospital of South Manchester, Manchester NHS Foundation Trust, Manchester, UK.
3 GOLD, Vancouver, WA, USA.
4 General Management, University Hospital, University of Leuven, Leuven, Belgium.