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Websites
- CDC National Health Statistics Reports, Number 18, 30 July 2009. www.cdc.gov/nchs/data/nhsr/nhsr018.pdf
- NCHS Data Brief, Number 61, April 2011. www.cdc.gov/nchs/data/databriefs/db61.pdf
- Using Dietary Supplements Wisely. National Institute of Health. National Center for Complementary and Alternative Medicine. http://nccam.nih.gov/health/supplements/wiseuse.htm