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.
McCrink L, Allen RP, Wolowacz SE, Sherrill B, Connolly M, Kirsch J. Predictors of health-related quality of life in sufferers with restless legs syndrome: a multi-national study. Sleep Med. 2007 Jan 1;8(1):73-83.