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年龄最小4岁,最大12岁,平均年龄7.85岁.所有病例均经体检排除器质性疾病,智力、发育均属正常.
The youngest 4 years old, maximum 12 years old, mean age 7.85 years old .All cases were excluded from the physical examination of organic disease, mental, and development are normal.