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Myalgic Encephalomyelitis/chronic fatigue syndrome (ME/CFS) is a disabling condition characterized by severe unexplained fatigue and a mixed profile of symptoms such as sore throat, painful/swollen lymph nodes, muscle pain, joint pain, headaches, unrefreshing sleep, post-exertional malaise and cognitive difficulties (K. Fukuda et al., 1994).
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Leonard A. Jason