RT Journal Article SR Electronic T1 Television viewing and asthma: spurious relationship? JF Thorax JO Thorax FD BMJ Publishing Group Ltd and British Thoracic Society SP 449 OP 449 DO 10.1136/thx.2009.121111 VO 66 IS 5 A1 Johannes C van der Wouden YR 2011 UL http://thorax.bmj.com/content/66/5/449.1.abstract AB