- “Medical interventions not taught widely at U.S. medical schools or generally available at U.S. hospitals. Examples include acupuncture, chiropractic, and massage therapy.”
- Eisenberg, D.M., Kessler, R.C., Foster, C., Norlock, F.E., Calkins, D.R. & Delbanco, T.L.(1993).Unconventional Medicine in United States- Prevalence, cost and patterns of use. The New England Journal of Medicine;328: 246-252.