RT Journal Article SR Electronic T1 Measuring lung function using sound waves: role of the forced oscillation technique and impulse oscillometry system JF Breathe JO Breathe FD European Respiratory Society SP 57 OP 65 DO 10.1183/20734735.020514 VO 11 IS 1 A1 Bill Brashier A1 Sundeep Salvi YR 2015 UL http://breathe.ersjournals.com/content/11/1/57.abstract AB