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Keyword
- 25(OH)D1
- 25-hydroxyvitamin D 1
- COPD1
- FEV1/FVC ratio1
- Forced Expiratory Volume in the 1st second over the Forced Vital Capacity 1
- NHANES1
- National Health and Nutrition Examination Survey 1
- Obstructive Lung Disease1
- breastfeeding, assisted reproductive technologies, initiation, duration, exclusive, systematic review1
- spirometry 1
- vitamin D1