PT - JOURNAL ARTICLE AU - Y. Ling AU - W. Saleem AU - C. D. Shee TI - Concomitant use of β-blockers and β<sub>2</sub>-agonists AID - 10.1183/09031936.00153707 DP - 2008 Apr 01 TA - European Respiratory Journal PG - 905--906 VI - 31 IP - 4 4099 - http://erj.ersjournals.com/content/31/4/905.short 4100 - http://erj.ersjournals.com/content/31/4/905.full SO - Eur Respir J2008 Apr 01; 31