Upton, M. N., McConnachie, A., McSharry, C., Hart, C. L., Davey Smith, G., Gillis, C. R., & Watt, G. C. M. (2000). Intergenerational 20 year trends in the prevalence of asthma and hay fever in adults: The Midspan family study surveys of parents and offspring. British Medical Journal.

Upton, Mark N., Alex McConnachie, Charles McSharry, Carole L. Hart, George Davey Smith, Charles R. Gillis, and Graham C M. Watt. Intergenerational 20 Year Trends in the Prevalence of Asthma and Hay Fever in Adults: The Midspan Family Study Surveys of Parents and Offspring. British Medical Journal, 2000.

Upton, Mark N., et al. Intergenerational 20 Year Trends in the Prevalence of Asthma and Hay Fever in Adults: The Midspan Family Study Surveys of Parents and Offspring. British Medical Journal, 2000.