1 Department of Respiratory Medicine, Copenhagen University Hospital-Bispebjerg and Frederiksberg, 2400, Copenhagen, Denmark. Electronic address: research@fally.dk.
2 Division of Infection, Immunity and Respiratory Medicine, School of Biological Sciences, The University of Manchester, Manchester Academic Health Science Centre, Manchester, M23 9LT, UK; North West Lung Centre, Wythenshawe Hospital, Manchester University NHS Foundation Trust, Manchester, M23 9LT, UK.
3 MRC/NIHR Trials Methodology Research Partnership, Department of Health Data Science, University of Liverpool, Liverpool, L69 3BX, UK.