Figure 1.

Flowchart of recruitment and ascertainment of cases. Note: 1 Chronic fatigue syndrome (CFS), myalgic enchephalopathy (ME), post viral asthenic syndrome (PVAS), fatigue syndrome (FS), fibromyalgia (FMS), post-infectious encephalitis (PIE), and any other codes offered by the GPs to denote cases of ME/CFS.

Nacul et al. BMC Medicine 2011 9:91   doi:10.1186/1741-7015-9-91
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