1 Dept of Pulmonary Medicine, Medisch Spectrum Twente, Enschede, The Netherlands a.lenferink@mst.nl.
2 Dept of Health Technology and Services Research, Faculty of Behavioural, Management and Social sciences, Technical Medical Centre, University of Twente, Enschede, The Netherlands.
3 Dept of Pulmonary Medicine, Medisch Spectrum Twente, Enschede, The Netherlands.
4 Dept of Research Methodology, Measurement, and Data-Analysis, Faculty of Behavioural, Management and Social sciences, University of Twente, Enschede, The Netherlands.
5 College of Medicine and Public Health, Flinders University, Adelaide, Australia.
6 Southern Adelaide Diabetes and Endocrine Services, Flinders Medical Centre, Adelaide, Australia.
7 Medical School Twente, Medisch Spectrum Twente, Enschede, The Netherlands.