Reference:
1. Drug Information Handbook 19th Edition 2010-2011
2. Levine M, Rumsey SC, Daruwala R, Park JB, and Wang Y. Criteria and recommendations for Vitamin C Intake. JAMA. 1999, 281(15): 1415-1423.
3. www.food.gov.uk/multimedia/pdfs/evm_c.pdf
4. http://www.pl.barc.usda.gov/downloads/jp23.pdf
5. http://www.fao.org/DOCREP/004/Y2809E/y2809e0c.htm
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