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2.Sudarma V, Sukmaniah S, Siregar P. Effect of dark chocolate on nitric oxide serum levels and blood pressure in prehypertension subjects. Acta Med Indones. 2011 Oct;43(4):224-8. http://www.ncbi.nlm.nih.gov/pubmed/22156352
3.Taubert D, Berkels R, Roesen R, Klaus W. Chocolate and blood pressure in elderly individuals with isolated systolic hypertension. JAMA. 2003 Aug 27;290(8):1029-30. http://www.bluefrogchocolates.com/Chocolate&BPJAMA8~27~03.pdf