Dong Naijun: Associate chief physician, Director of Reproductive Medicine Center.

董乃俊: 副主任医师, 生殖医学中心主任.

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He works at the Kentucky Center for reproductive Medicine and Invitro Fertilization.

他现在供职于肯塔基生殖保健品和体外受精研究中心.

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As a new technique in reproductive medicine , oocyte cryopreservation has been used more and more widely.

介绍作为辅助生殖技术一项新技术,卵子冷冻技术.

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