RT Journal Article SR Electronic T1 Re-assessing the evidence about inhaled corticosteroids in chronic obstructive pulmonary disease JF Thorax JO Thorax FD BMJ Publishing Group Ltd and British Thoracic Society SP 3 OP 4 DO 10.1136/thx.54.1.3 VO 54 IS 1 A1 P M A CALVERLEY YR 1999 UL http://thorax.bmj.com/content/54/1/3.abstract AB