Ellison-Loschmann L, Sunyer J, Plana E, Pearce N, Zock JP, Jarvis D. Socioeconomic status, asthma and chronic bronchitis in a large community-based study. Eur Respir J. 2007 May;29(5):897-905.
Sunyer J, Pekkanen J, Garcia-Esteban R, Svanes C, Kunzli N, Janson C, de Marco R, Anto JM, Burney P. Asthma score: predictive ability and risk factors. Allergy. 2007 Feb;62(2):142-8. doi: 10.1111/j.1398-9995.2006.01184.x