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Lo JO, Shaffer BL, Allen AJ, Little SE, Cheng YW, Caughey AB.Lo JO, et al. Among authors: shaffer bl.J Matern Fetal Neonatal Med. 2015;28(18):2254-8. doi: 10.3109/14767058.2014.984605. Epub 2014 Nov 28.J Matern Fetal Neonatal Med. 2015.PMID: 25371372