RT Journal Article SR Electronic T1 Postnatal environmental tobacco smoke exposure is associated with objective markers of atopy in preschool-aged children JF Evidence Based Medicine JO Evid Based Med FD BMJ Publishing Group Ltd SP 219 OP 219 DO 10.1136/ebmed-2014-110134 VO 20 IS 6 A1 Jonathan M. Gaffin YR 2015 UL http://ebm.bmj.com/content/20/6/219.abstract AB