RT Journal Article SR Electronic T1 Theophylline again? Reasons for believing JF European Respiratory Journal JO Eur Respir J FD European Respiratory Society SP 5 OP 6 DO 10.1183/09031936.00011309 VO 34 IS 1 A1 B. G. Cosio A1 J. B. Soriano YR 2009 UL http://erj.ersjournals.com/content/34/1/5.abstract AB