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BACKGROUND Associations between vitamin D and pregnancy outcomes have been inconsistent. OBJECTIVES We described the distribution of 25-hydroxyvitamin D3 [25(OH)D3], 3-epi-25(OH)D3, and 25(OH)D2 in(More)
BACKGROUND The Vitamin D Standardization Program (VDSP) has developed protocols for standardizing procedures of 25-hydroxyvitamin D [25(OH)D] measurement in National Health/Nutrition Surveys to(More)