RT Journal Article SR Electronic T1 Long term treatment with salbutamol and salmeterol JF Thorax JO Thorax FD BMJ Publishing Group Ltd and British Thoracic Society SP 186 OP 186 DO 10.1136/thx.54.2.186c VO 54 IS 2 YR 1999 UL http://thorax.bmj.com/content/54/2/186.4.abstract AB