方法：采用现场调查、专家咨询、专题组座谈和个人深入访谈，对唐氏综合征产前诊断项目的标准成本进行测算。

Methods: Field survey, experts counseling and focus group interviews were employed to collect data and calculate standard cost of diagnosis of Down's Syndrome.

youdao

方法：采用现场调查、专家咨询、专题组座谈和个人深入访谈，对唐氏综合征产前诊断项目的标准成本进行测算。

Methods: Field survey, experts counseling and focus group interviews were employed to collect data and calculate standard cost of diagnosis of Down's Syndrome.

youdao