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Jellin JM, editor. Pharmacist's Letter/Prescriber's Letter Natural Medicines Comprehensive Database Web site. Available at: http://naturaldatabase.com/. Accessed October 18, 2007.
Phytopharma. Hoodia factfile (no date listed). Available at: http://www.phytopharm.com/hoodiafactfile/. Accessed October 18, 2007.