RT Journal Article SR Electronic T1 Breast feeding and childhood asthma JF Thorax JO Thorax FD BMJ Publishing Group Ltd and British Thoracic Society SP 558 OP 559 DO 10.1136/thx.2008.105130 VO 64 IS 7 A1 Oddy, Wendy H YR 2009 UL http://thorax.bmj.com/content/64/7/558.abstract AB