University of Edinburgh - Usher Institute of Population Health Sciences and Informatics, University of Strathclyde - Department of Mathematics & Statistics, University of Edinburgh - Usher Institute of Population Health Sciences and Informatics, University of Edinburgh - Centre for Global Health, University of Edinburgh - Asthma UK Centre for Applied Research, Public Health Scotland, University of St. Andrews - School of Medicine, University of St. Andrews - School of Medicine, University of Edinburgh - Usher Institute of Population Health Sciences and Informatics, University of Edinburgh - Centre for Medical Informatics, University of Edinburgh - Usher Institute of Population Health Sciences and Informatics, Public Health Scotland, University of Aberdeen - Centre of Academic Primary Care, Public Health Scotland, University of Oxford - Nuffield Department of Primary Care Health Sciences and University of Edinburgh - Usher Institute