University of Edinburgh - Asthma UK Centre for Applied Research, Victoria University of Wellington - School of Health, University of Strathclyde - Department of Mathematics & Statistics, University of Edinburgh - Centre for Global Health, University of Edinburgh - Usher Institute of Population Health Sciences and Informatics, University of St. Andrews - School of Medicine, Swansea University - Health Data Research UK, Swansea University - Population Data Science, BREATHE – The Health Data Research Hub for Respiratory Health, Queen’s University Belfast - Public Health Agency, University of Edinburgh - Usher Institute of Population Health Sciences and Informatics, University of Oxford, University of Edinburgh - Centre for Medical Informatics, Swansea University - Health Informatics Group, University of Oxford - Nuffield Department of Primary Care Health Sciences, University of Oxford - Nuffield Department of Primary Care Health Sciences, University of Glasgow - Institute of Health and Wellbeing, The University of Edinburgh - Royal Infirmary of Edinburgh, University of St. Andrews - School of Medicine, Nuffield Department of Primary Care Health Sciences, University of Oxford, Public Health Scotland, Public Health Scotland, Public Health Scotland, University of Strathclyde - Department of Mathematics & Statistics, University of Aberdeen - Centre of Academic Primary Care, University of Edinburgh - Usher Institute, University of Edinburgh - Usher Institute of Population Health Sciences and Informatics, Swansea University - Population Data Science, University of Oxford - Nuffield Department of Primary Care Health Sciences, Public Health Scotland - Clinical and Public Health Intelligence Team, University of Edinburgh - Usher Institute of Population Health Sciences and Informatics and University of Edinburgh - Usher Institute

University of Oxford - Nuffield Department of Primary Care Health Sciences, University of Oxford - Nuffield Department of Primary Care Health Sciences, University of Oxford - Nuffield Department of Primary Care Health Sciences, affiliation not provided to SSRN, affiliation not provided to SSRN, University of Oxford - Nuffield Department of Primary Care Health Sciences, affiliation not provided to SSRN, Royal College of General Practitioners, University of Oxford - Nuffield Department of Primary Care Health Sciences, Swansea University - Population Data Science, Queen’s University Belfast - Public Health Agency, Swansea University - Population Data Science, Swansea University - Population Data Science, Swansea University - Department of Education and Childhood Studies, University of Strathclyde - Department of Mathematics & Statistics, BREATHE – The Health Data Research Hub for Respiratory Health, Royal College of General Practitioners - Royal College of General Practitioners (RCGP) Research and Surveillance Centre (RSC), University of Edinburgh - Usher Institute, University of Oxford - Nuffield Department of Primary Care Health Sciences and University of Oxford