Drupal-Bibcite31<style face="normal" font="default" size="100%">Linking e-health records, patient-reported symptoms and environmental exposure data to characterise and model COPD exacerbations: protocol for the COPE study</style><style face="normal" font="default" size="100%">Linking e-health records, patient-reported symptoms and environmental exposure data to characterise and model COPD exacerbations: protocol for the COPE study</style>