他们研究被称为拷贝数变异（CNV）的染色体的删减和复制，发现在患有多动症的儿童中有 16%都存在。
Their study looked for chromosomal deletions and duplications known as copy number variants (CNV) and found that these were present in 16% of the children with ADHD.
他们研究被称为拷贝数变异（CNV）的染色体的删减和复制，发现在患有多动症的儿童中有 16%都存在。
Their study looked for chromosomal deletions and duplications known as copy number variants (CNV) and found that these were present in 16% of the children with ADHD.
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