1. Department of Epidemiology; University of Groningen; University Medical Center Groningen; Groningen The Netherlands
2. Department of Pulmonology and Tuberculosis; University of Groningen; University Medical Center Groningen; Groningen The Netherlands
3. Department of Pulmonology; Erasmus MC-University Medical Center; Rotterdam The Netherlands
4. Department of Pulmonology; University Medical Center Utrecht; Utrecht The Netherlands
5. Department of Cardiothoracic Surgery; University of Groningen; University Medical Center Groningen; Groningen The Netherlands