1Global Initiative for Asthma(GINA). Global strategy for asth-ma management and prevention ( updated 2009) [EB/OL]2009-12-31 /2012-08-01. http: //www. ginasthma. org.
1Goldberg S, Springer C, Avital A, et al.Can peak expiratory flow measurements estimate small airway function in asthmatic children[J].Chest, 2001,120 ( 2 ) : 482-488.
2White P.Spirometry and peak expiratory flow in the primary care management of COPD[J].Prim Care Respir J, 2004,13 (1): 5-8.