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[1] Northwestern Scholars (August 2005),[Link]

[2] The National Academies Press (2013), [Link]

[3] US National Library of Medicine (December 2002), [Link]

[4] US National Library of Medicine (July 2012), [Link]

[5] Europe PMC (September 2011), [Link]

[6] British Journal of Dermatology (July 2013), [Link]

[7] ResearchGate (October 2017), [Link]

[8] British Journal of Nutrition (August 2013), [Link]

[9] Semantic Scholar (July 2013), [Link]

[10] ] US National Library of Medicine (May 1989), [Link]

[11] ScienceDirect (May 2014), [Link]

[12] National Academy of Sciences (September 2016), [Link]

[13] US National Library of Medicine (September 2012), [Link]

[14] University of Massachusetts Medical (October 2012), [Link]

[15] US National Library of Medicine (December 2009), [Link]