1. Ernst E et al. (1995) Complementary medicine—a definition. Br J Gen Pract 45: 506
2. Barnes PM et al. (2004) Complementary and alternative medicine use among adults: United States, 2002. Advance data from vital and health statistics; no 343. Hyattsville: US Department of Health and Human Services, CDC, National Center for Health Statistics
3. Ernst E et al. (2001) The desktop guide to complementary and alternative medicine. Edinburgh: Mosby
4. Rhee SM et al. (2004) Use of complementary and alternative medicines by ambulatory patients. Arch Intern Med 164: 1004–1009
5. Harrison RA et al. (2004) Are those in need taking dietary supplements? A survey of 21,923 adults. Br J Nutr 91: 617–623