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Study design overview for the randomized controlled trial evaluating vitamin D3 supplementation on upper respiratory tract infection symptoms during winter training in taekwondo athletes.

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Vitamin D₃ Supplementation Reduces the Symptoms of Upper Respiratory Tract Infection during Winter Training in Vitamin D-Insufficient Taekwondo Athletes: A …

International journal of environmental research and public health (2018)

PMID: 30223447

DOI: 10.3390/ijerph15092003

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![Figure 1: Study design overview for the randomized controlled trial evaluating vitamin D3 supplementation on upper respiratory tract infection symptoms during winter training in taekwondo athletes.]()

> Source: Hyun Chul Jung et al. "Vitamin D₃ Supplementation Reduces the Symptoms of Upper Respiratory Tract Infec." *International journal of environmental research and public health*, 2018. PMID: [30223447](https://pubmed.ncbi.nlm.nih.gov/30223447/)

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  <img src="" alt="Study design overview for the randomized controlled trial evaluating vitamin D3 supplementation on upper respiratory tract infection symptoms during winter training in taekwondo athletes." />
  <figcaption>Figure 1. Study design overview for the randomized controlled trial evaluating vitamin D3 supplementation on upper respiratory tract infection symptoms during winter training in taekwondo athletes.<br>  Source: Hyun Chul Jung et al. "Vitamin D₃ Supplementation Reduces the Symptoms of Upper Respiratory Tract Infec." <em>International journal of environmental research and public health</em>, 2018. PMID: <a href="https://pubmed.ncbi.nlm.nih.gov/30223447/">30223447</a></figcaption>
</figure>

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