4"Guide for Asthma Management and Prevention," Global Initiative for Asthma (GINA) 2009, 2011, http: //www.ginasthma.org.
5American Thoracic Society. Snowbird workshop on standardization of spirometry [J]. Am RevRespir Dis, 1979, 119: 831-838.
6Quanjer PH, ed. Standardized lung function testing. Report Work- ing Party Standardization of Lung Function Tests, European Com- munity for Coal and Steel [J]. Bull Eur Physiopathol Respir, 1983, 19 (5): 1-95.
7Miller MR, Hankinson J, Brusasco V, et al. Standardization of spirometry [J]. Eur Respir, 2005, 26 (2): 319-338.
9Riedler J, Reade T, Dalton M, et al. Hypertonic saline challenge in an epidemiologic survey of asthma in children [J ]. Am J Respir Crit Care Med, 1994, 150: 1632-1639.
10Khalid L, Morris ZD, Diqiovine B. Specific conductance criteria for a positive methacholine challenge test: are the American Tho- racic Society guidelines rather generous [J]. Respir Care, 2009, 54 (9): 1168-1174.