1 Department of General Practice, Groningen Research Institute for Asthma and COPD (GRIAC), University Medical Center Groningen, University of Groningen, Groningen, Netherlands. Electronic address: [email protected].
2 Department of Family Medicine, University of Medicine and Pharmacy, Ho Chi Minh City, Vietnam.
3 Department of Pulmonology, Makerere University, Makerere University Lung Institute, Kampala, Uganda.
4 Department of Public Health and Primary Care, Leiden University Medical Center, Leiden, Netherlands.