Impulse oscillometry provides an effective measure of lung dysfunction in 4-year-old children at risk for persistent asthma.
Marotta A, Klinnert MD, Price MR, Larsen GL, Liu AH. Impulse oscillometry provides an effective measure of lung dysfunction in 4-year-old children at risk for persistent asthma. J Allergy Clin Immunol. 2003 Aug; 112(2):317-22.