1. Department of Internal Medicine, Universitair Ziekenhuis Brussel (UZ Brussel), Brussels, Belgium
2. Department of Pulmonary Medicine, Universitair Ziekenhuis Brussel (UZ Brussel), Brussels, Belgium
3. Department of Pulmonary Medicine, Universitair Ziekenhuis Leuven (UZ Leuven), Leuven, Belgium
4. Department of Pulmonary Medicine, Ziekenhuis Netwerk Antwerpen Middelheim (ZNA Middelheim), Antwerp, Belgium
5. Department of Intensive Care Medicine, Ziekenhuis Netwerk Antwerpen Middelheim (ZNA Middelheim), Antwerp, Belgium