RT Journal Article SR Electronic T1 Learning curves for bronchoscopy and simulation JF Clinical Medicine JO Clin Med FD Royal College of Physicians SP 418 OP 419 DO 10.7861/clinmedicine.13-4-418 VO 13 IS 4 A1 Andrew RL Medford YR 2013 UL http://www.rcpjournals.org/content/13/4/418.abstract