Efficacy of epidural analgesia with ropivacaine on labor , maternal , and neonatal : a meta-analysis of prospective and retrospective studies
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Guohai Xu | Lieliang Zhang | Fan Xiao | Jing Zhang | Jun Ying | F. Hua | Xiaohong Du | Yong Chen | Yanhui Hu | Zhenzhong Luo | Xiaofei Long | X. Long | Fuzhou Hua