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Key symptoms of CFS/ME by case definitions. CFS chronic fatigue syndrome, ME myalgic encephalitis, PEM postexertion malaise, IOM Institute of Medicine, SEID systemic exertion intolerance disease, NICE National Institute for Health and Care Excellence, PVES Post viral exhaustion syndrome. Holmes. ECD epidemiology case definition, CCC Canadian Consensus Criteria, ICC International Consensus Criteria
