Using findings from observational studies to guide vitamin D randomized controlled trials

Authors

  • W. B. Grant

    Corresponding author
    1. Sunlight, Nutrition, and Health Research Center, San Francisco, CA, USA
    • Correspondence: William B. Grant PhD, Sunlight, Nutrition, and Health Research Center, P.O. Box 641603, San Francisco, CA 94164-1603, USA.

      (e-mail: wbgrant@infionline.net).

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