Also known as: Encephalomyelitis, Myalgic / Fatigue Syndrome, Chronic / Chronic Fatigue Syndrome (CFS) / Chronic Fatigue Syndrome / Myalgic Encephalomyelitis / Chronic Fatigue Syndromes / Chronic Fatigue Syndrome/ Myalgic Encephalitis (CFS/ME) / Myalgic encephalomyelitis/chronic fatigue syndrome / Postviral fatigue syndrome / Postviral and related fatigue syndromes / Chronic fatigue, unspecified / Royal Free disease / Postviral fatigue syndrome (disorder) / Post viral fatigue syndrome / Chronic fatigue syndrome (disorder)