RT Journal Article SR Electronic T1 How much is too much? The treatment of mild asthma JF European Respiratory Journal JO Eur Respir J FD European Respiratory Society SP 403 OP 406 DO 10.1183/09031936.00084107 VO 30 IS 3 A1 P. M. O’Byrne YR 2007 UL http://erj.ersjournals.com/content/30/3/403.abstract AB