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Keyword
25(OH)D
1
25-hydroxyvitamin D
1
COPD
1
FEV1/FVC ratio
1
Forced Expiratory Volume in the 1st second over the Forced Vital Capacity
1
NHANES
[remove]
1
National Health and Nutrition Examination Survey
1
Obstructive Lung Disease
1
spirometry
1
vitamin D
1