
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
Practical Preventive Medicine ›› 2017, Vol. 24 ›› Issue (7) : 852-853.
Pre-pregnancy preparation for the second child in puerperaewith advanced maternal age in Qingdao City, 2015
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