1. Department of Parasitology Leiden University Center for Infectious Diseases (LU‐CID), Leiden University Medical Center Leiden The Netherlands
2. Department of Internal Medicine, Section Allergology and Clinical Immunology Erasmus University Medical Center Rotterdam The Netherlands
3. Department of Pulmonology University Medical Center Groningen Groningen The Netherlands
4. Department of Pathology and Medical Biology University Medical Center Groningen Groningen The Netherlands
5. Department of Pulmonology Franciscus Gasthuis and Vlietland Rotterdam The Netherlands
6. Department of Pulmonology Erasmus Medical Center Rotterdam The Netherlands
7. Netherlands Center of Clinical Occupational Medicine The Netherlands