The effect of vitamin D on COPD exacerbation: a double blind randomized placebo-controlled parallel clinical trial
| Main Authors: | , , , |
|---|---|
| Format: | Online |
| Language: | English |
| Published: |
BioMed Central
2016
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| Online Access: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5002185/ |