Occurrence and related factors of delayed lactation initiation of parturients in Tongzhou District, Beijing
WEI Zhan-chao, ZHAO Zhi-ling, MENG Tong, YE Qi, WAN Ying, LIU Ya-fei
South China Journal of Preventive Medicine . 2022, (7): 817 -821 .  DOI: 10.12183/j.scjpm.2022.0817

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