1 University of Copenhagen and Bispebjerg-Frederiksberg Hospitals, Copenhagen, Denmark.
2 Marmara University, Istanbul, Turkey.
3 Dept of Primary Care and Public Health, Imperial College, London, UK.
4 Dept of Sustainable Health, The OLIN Unit, Umeå University, Umeå, Sweden.
5 Uppsala University, Uppsala, Sweden.
6 National and Kapodistrian University of Athens, Athens, Greece.
7 CICS-UBI - Health Sciences Research Centre, University of Beira Interior, Covilhã, Portugal and NOVA National School of Public Health, Public Health Research Centre, Universidade NOVA de Lisboa, Lisbon, Portugal.
8 European Lung Foundation, Sheffield, UK.
9 University of Manchester and the Manchester University NHS Foundation Trust, Manchester, UK.