1. University Maastricht, Faculty of Health, Medicine & Life Sciences, Department of Health Care Studies, PO Box 616, 6200 MD Maastricht, The Netherlands, University Hospital Maastricht, Department of Integrated Care, PO Box 5800, 6202 AZ Maastricht, The Netherlands
2. Medical Centre Alkmaar, Department of Pulmonology, PO Box 501, 1800 AM Alkmaar, The Netherlands
3. University Maastricht, Faculty of Health, Medicine & Life Sciences, Department of Health Care Studies, PO Box 616, 6200 MD Maastricht, The Netherlands