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S40200-016-0257-3
S40200-016-0257-3
http://dx.doi.org/10.1186/S40200-016-0257-3
The effect of vitamin D on COPD exacerbation: a double blind randomized placebo-controlled parallel clinical trial.
P356
Q37212032-17AE1731-3ECE-49C6-99C8-C523C033D508
P356
S40200-016-0257-3
http://dx.doi.org/10.1186/S40200-016-0257-3