"Evidence-Based Complementary and Alternative Medicine (eCAM) is an international, peer-reviewed journal that seeks to understand the sources and to encourage rigorous research in this new, yet ancient world of complementary and alternative medicine."
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The point being made here is that if something has been proven to work, it is no longer alternative medicine. "Evidence based alternative" is a contradiction.
Alternative medicine is any healing practice:
"that does not fall within the realm of conventional medicine."
http://en.wikipedia.org/wiki/Alternative_medicine
"Conventional medicine" being "medicine for which there actually exists evidence of it working."
source ?
don't forget : 51% Unknown effectiveness ..
http://clinicalevidence.bmj.com/ceweb/about/knowledge.jsp
one example "Unknown effectiveness"
"Pancreatic cancer New option(s) added for: Chemoradiotherapy for resected pancreatic cancer One long-term follow-up study added. It found no significant difference between adjuvant chemoradiotherapy and surgery alone for overall survival or progression-free survival at 11.7 years' follow-up. Categorisation unchanged (Unknown effectiveness), as the evidence is not strong enough to draw definitive conclusion."