Duh!!!: You don't need to know because it will not help you care for yourself. Only if you are writing a research paper. For chronic pain begin a self-care with a wellness program of vits, magnesium glycinate, sleep hygiene, exercise, self massage, chiropractor, yoga, heat, epsom tub soaking, stretching all are needed. In my practice I use acupuncture and myofascial tissue release.
Answered 12/26/2014
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