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- Nonaka, Daisuke, et al. Show all 7 Authors
- Clinical nutrition 2017 v.36 pp. 1288-1293
- blood serum; business enterprises; case-control studies; confidence interval; human resources; influenza; odds ratio; protein binding; questionnaires; regression analysis; risk; vaccination; vitamin D; winter; Japan
- ... Several intervention studies have examined the effect of vitamin D supplementation on influenza or influenza-like illness, but their results have been inconsistent. We prospectively examined the association of serum 25-hydroxyvitamin D with influenza among Japanese workers.We conducted a nested case-control study in a cohort of workers in 4 companies in the Kanto and Tokai areas of Japan. Physicia ...