Measurements will be conducted at admission to the hospital (baseline measurements) and before discharge from the hospital. Clinical examinations at Landspitali National University Hospital are planned 3, 6 and 12 months after discharge from the hospital. All together we aim at having five measurement points for each subject. Each examination will take ~ 80 minutes (30 min for the FEV1 and FVC tests, 20 min for the walking test and measurement of hand-grip strength, and 30 min for the 24-hour recalls and HRQoL questionnaires). Additionally, the subjects will be contacted on at least two other occasions by phone, in weeks 2 and 6 (each interview ~20 min).