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STUDY OBJECTIVE To examine recent national trends in outpatient visits for sleep related difficulties in the United States and prescriptions for sleep medications. DESIGN Trend analysis. SETTING(More)
BACKGROUND National spirometric surveillance data in the United States were last collected during 1988-1994. The objective of this study was to provide current estimates for obstructive and(More)
BACKGROUND We examined the association of impaired lung function and respiratory symptoms with measures of health status and health-related quality of life (HRQOL) among US adults. METHODS The(More)