RT Journal Article SR Electronic T1 Further evidence on the dangers of exposure to second hand tobacco smoke JF Thorax JO Thorax FD BMJ Publishing Group Ltd and British Thoracic Society SP 473 OP 473 DO 10.1136/thx.2005.la0148 VO 60 IS 6 A1 E Cetti YR 2005 UL http://thorax.bmj.com/content/60/6/473.abstract AB