RT Journal Article SR Electronic T1 How much asthma is really attributable to atopy? JF Thorax JO Thorax FD BMJ Publishing Group Ltd and British Thoracic Society SP 268 OP 272 DO 10.1136/thx.54.3.268 VO 54 IS 3 A1 Pearce, Neil A1 Pekkanen, Juha A1 Beasley, Richard YR 1999 UL http://thorax.bmj.com/content/54/3/268.abstract AB