2015年青岛市高龄产妇二胎生育孕前保健调查研究
俞玫君, 刘巧英,吴玉坤
Pre-pregnancy preparation for the second child in puerperaewith advanced maternal age in Qingdao City, 2015
YU Mei-jun, LIU Qiao-ying, WU Yu-kun
实用预防医学
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2017, (7): 852
-853
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DOI: 10.3969/j.issn.1006-3110.2017.07.025