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Abstract
According to the World Health Organization visual analog scale ranking, 0 referred to no pain and 10 referred to baryodynia. The electromyography examination was normal in 11 patients, while it was abnormal in five patients; and slow sensory nerve conduction velocity and reduced amplitude were mainly observed. [...]the brain magnetic resonance imaging and lumbar puncture of seven patients with headache were normal. [...]history taking is all important, and mercury chelation treatment should be given after diagnosis as soon as possible.