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http://www.who.int/gb/EB_WHA/PDF/WHA56/ea5618.pdf
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2. Center for Drug Evaluation and Research, US Food and Drug Administration. Guidance for Industry Botanical Drug Products. Fed. Register 65, 49247–49248, 2000. (
http://www.fda.gov/cder/guidance/1221dft.pdf
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3. European Parliament. Directive 2001/83/EC of the European Parliament and of the Council of 6 November 2001 on the Community code relating to medicinal products for human use. (Official J. Eur. Commun., L311, 67–128, 2001. (
http://europa.eu.int/eur-lex/pri/en/oj/dat/2001/l_311/l_31120011128en00670128.pdf
).