RT Journal Article SR Electronic T1 Bronchial challenge tests: usefulness, availability and limitations JF Breathe JO breathe FD European Respiratory Society SP 53 OP 60 DO 10.1183/20734735.003111 VO 8 IS 1 A1 S.D. Anderson YR 2011 UL http://breathe.ersjournals.com/content/8/1/53.abstract AB