1 Department of Respiratory Medicine, Amsterdam University Medical Center, University of Amsterdam, Amsterdam, the Netherlands. Electronic address: k.a.eger@amsterdamumc.nl.
2 Department of Clinical Pharmacy and Pharmacology, Medical Center Leeuwarden, Leeuwarden, the Netherlands.
3 Department of Respiratory Medicine, Medical Center Leeuwarden, Leeuwarden, the Netherlands.
4 Department of Respiratory Medicine, Amsterdam University Medical Center, University of Amsterdam, Amsterdam, the Netherlands.