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CFS is the unexplained chronic fatigue which has concurrently 4 or more of 8 symptoms (post-exertion malaise lasting more than 24 hours; multi-joint pain without swelling or redness; unrefreshing sleep; headaches of a new type, pattern, or severity; significant impairment of short-term memory or concentration; tender cervical or axillary lymph nodes; muscle pain; a sore throat that is frequent or recurring).
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