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So PL, Li KW, Yeung TW, Sin WK.So PL, et al. Among authors: yeung tw.BMC Pregnancy Childbirth. 2019 Aug 27;19(1):311. doi: 10.1186/s12884-019-2459-4.BMC Pregnancy Childbirth. 2019.PMID: 31455300Free PMC article.