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Biblio
] . Underdiagnosis and undertreatment of asthma in the elderly. Cardiovascular Health Study Research Group. Chest. 1999 ;116(3):603-13.
. Correlates of peak expiratory flow lability in elderly persons. Chest. 2001 ;120(6):1861-8.
. Regression-based variable clustering for data reduction. Stat Med. 2002 ;21(6):921-41.