National Institutes of Health, U.S.A.
Office of Dietary Supplements
Christopher T. Sempos, Ph.D.
Program Coordinator, Vitamin D Standardization Program
Email: semposch@mail.nih.gov
Web site: ods.od.nih.gov/vdsp
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Centers for Disease Control and Prevention, U.S.A.
Vitamin D Standardization-Certification Program
Hubert W. Vesper, Ph.D.
Director, CDC Standardization-Certification Program
Email: hav2@cdc.gov
Web site: www.cdc.gov/labstandards/hs.html
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American Association for Clinical Chemistry
Web site: www.aacc.org
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International Federation of Clinical Chemistry
and Laboratory Medicine
Ian S. Young, M.D., Ph.D.
Professor of Medicine, Queen’s University Belfast
Email: I.Young@qub.ac.uk
Web site: http://www.ifcc.org
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National Health and Nutrition Surveys
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The Mexican Health and Nutrition Survey 2006
Simón Barquera, M.D., M.S., Ph.D.
Investigator Nacional SNI-CONACYT
Director del Area de Epidemiologia Nutricional
Instituto Nacional de Salud Publica
Email: sbarquera@insp.mx
Website: http://ensanut.insp.mx/
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