Analysis of factors influencing safety of department of obstetrics based on “the second child” policy and investigation of countermeasures
CHEN Shu-fang, ZHANG Chen, CHEN Yan, CHENG Wei-wei
上海交通大学学报（医学版） . 2016, (5): 742 .  DOI: 10.3969/j.issn.1674-8115.2016.05.025