RT Journal Article SR Electronic T1 What is the Minimal Clinically Important Difference for 3He MRI Ventilation Defects? JF European Respiratory Journal JO Eur Respir J FD European Respiratory Society SP 1800324 DO 10.1183/13993003.00324-2018 A1 Rachel L Eddy A1 Sarah Svenningsen A1 David G McCormack A1 Grace Parraga YR 2018 UL http://erj.ersjournals.com/content/early/2018/04/05/13993003.00324-2018.abstract AB