TY - JOUR T1 - Ask the Expert: Lung function measurement JF - Breathe JO - Breathe SP - 224 LP - 226 DO - 10.1183/18106838.0503.224 VL - 5 IS - 3 AU - M. Agnew Y1 - 2009/03/01 UR - http://breathe.ersjournals.com/content/5/3/224.abstract ER -