Brevoort P..The booming U.S. botanical market: A new overview.Herbalgram. 1998;44:33-46
2.
Eisenberg Dm,Davis Rb,Ettner Sl,Appal S,Wilkey S,Van Rompay Mv,Kessler Rc..Trends in alternative medicine use in the United States, 1990–1997.Journal of the American Medical Association. 1998;280:1569-1575
3.
Eisenberg Dm,Kessler Rc,Foster C,Norlock Fe,Calkins Dr,Delbanco Tl..Unconventional medicine in the United States: Prevalence, costs, and patterns of use.New England Journal of Medicine. 1993;328:246-252
4.
See D,Gurnee K,Leclair M..An in vitro screening study of 196 natural products for toxicity and efficacy.Journal of the American Nutraceutical Association. 1999;2:25-39