Manchun Fang

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BACKGROUND Many residents of the United States and Canada depend on dietary sources of vitamin D to help maintain vitamin D status. Because few natural food sources contain vitamin D, fortified foods may be required. OBJECTIVE We aimed to determine the effects of vitamin D-fortified foods on serum 25-hydroxyvitamin D [25(OH)D] concentrations. DESIGN We(More)
BACKGROUND As an increasingly large number of meta-analyses are published, quantitative methods are needed to help clinicians and systematic review teams determine when meta-analyses are not up to date. METHODS We propose new methods for determining when non-significant meta-analytic results might be overturned, based on a prediction of the number of(More)
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