1. Department of Respiratory Medicine and Endocrinology, Pulmonary Section, Copenhagen University Hospital Hvidovre, Hvidovre, Denmark
2. Department of Neurorehabilitation, Clinical Research Centre, Copenhagen University Hospital, Hvidovre, Hvidovre, Denmark
3. Department of Clinical Research, Copenhagen University Hospital, Hillerød, Denmark
4. Department of Neurorehabilitation, Copenhagen University Hospital Rigshospitalet, Kettegaard Allé 30, 2650 Hvidovre Denmark and Research Unit of Nursing and Health Care, Aarhus University, Denmark