Clinical Endocrinology · 2019 · 12 citations · 27 references
Vitamin D deficiency is not universal. Most urban outdoor workers do not have VDD.
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Low Vitamin D Status despite Abundant Sun Exposure
Neil Binkley, Rachel Novotny, Diane Krueger et al. · The Journal of Clinical Endocrinology & Metabolism · 2007 · 476 citations · Full text