方法住院甲状腺疾病采用回顾性调查方法。
Methods Hospital records for all thyroid diseases were reviewed using retrospective approach.
方法采用回顾性调查方法查阅甲状腺疾病住院病历。
Methods Information on hospitalized thyroid diseases was collected by retrospective approach.
方法：采用回顾性调查，分析引起新生儿医院感染的因素。
Methods: Retrospective investigation was conducted to analyse the factor of the newborn's hospital infection.
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