Reference:
• National Institutes of Health. Dietary Supplement Fact Sheet: Zinc, [cited April 30 ,2013] Available from: http://ods.od.nih.gov/factsheets/Zinc-HealthProfessional/
• U.S. National Library of Medicine. Zinc, [cited April 30 ,2013] Available from: http://www.nlm.nih.gov/medlineplus/druginfo/natural/982.html
• LIVESTRONG Foundation. Centrum Vitamins & Breastfeeding, [cited April 30 ,2013] Available from: http://www.livestrong.com/article/479538-centrum-vitamins-breastfeeding/
• University of Maryland Medical Center. Complementary medicine: Acne, , [cited May 1 ,2013] Available from: http://www.umm.edu/altmed/articles/acne-000001.htm
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