Childhood asthma prevalence: cross-sectional record linkage study comparing parent-reported wheeze with general practitioner-recorded asthma diagnoses from primary care electronic health records in Wales

Griffiths LJ, Lyons RA, Bandyopadhyay A, Tingay KS, Walton S, Cortina-Borja M, Akbari A, Bedford H, Dezateux C. Childhood asthma prevalence: cross-sectional record linkage study comparing parent-reported wheeze with general practitioner-recorded asthma diagnoses from primary care electronic health records in Wales. BMJ Open Respir Res. 2018; 5(1): e000260.