[1] University of Groningen,Department of Pulmonology
[2] University Medical Center Groningen,Department of Pathology and Medical Biology
[3] University of Groningen,Groningen Research Institute for Asthma and COPD (GRIAC)
[4] University Medical Center Groningen,Department of Respiratory Medicine and Allergology
[5] University of Groningen,Department of Epidemiology
[6] University Medical Center Groningen,undefined
[7] University Hospital,undefined
[8] University of Groningen,undefined
[9] University Medical Center Groningen,undefined