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[Correspondence] Graded exercise self-help for chronic fatigue syndrome in GETSET

I was surprised to read that the GETSET trial by Lucy Clark and colleagues1 excluded participants who had physical contraindications to exercise, as such a criterion would appear to exclude anyone suffering from post-exertional malaise (PEM). In its 2015 report,2 the US Institute of Medicine concluded: “There is sufficient evidence that PEM is a primary feature that helps distinguish ME/CFS [myalgic encephalomyelitis/chronic fatigue syndrome] from other conditions”. Indeed, post-exertional neuroimmune exhaustion is a compulsory requirement for a diagnosis of myalgic encephalomyelitis under the International Consensus Criteria.