RT Journal Article SR Electronic T1 Use of oestrogen only hormone replacement therapy associated with increased risk of asthma onset in postmenopausal women JF Evidence Based Medicine JO Evid Based Med FD BMJ Publishing Group Ltd SP 190 OP 191 DO 10.1136/ebm1135 VO 15 IS 6 A1 Julia Dratva YR 2010 UL http://ebm.bmj.com/content/15/6/190.abstract AB