Finding information about many careers in non-traditional areas is not usually found in traditional sources like Occupational Outlook Handbook from the U.S. Bureau of Labor or through mainstream publishers. Instead, information about careers in alternative medicine can often be found on the associations & organization web pages. Look at those pages for information.
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For Chiropractors -- See also
http://www.bls.gov/ooh/healthcare/chiropractors.htm
In addition, for information about careers in Western medical areas: