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Hwang SS, Smith VC, McCormick MC, Barfield WD.Hwang SS, et al. Among authors: barfield wd.Matern Child Health J. 2011 Aug;15(6):722-9. doi: 10.1007/s10995-010-0643-2.Matern Child Health J. 2011.PMID: 20652385
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Clements KM, Barfield WD, Kotelchuck M, Wilber N.Clements KM, et al. Among authors: barfield wd.Matern Child Health J. 2008 Nov;12(6):708-17. doi: 10.1007/s10995-007-0291-3. Epub 2007 Nov 16.Matern Child Health J. 2008.PMID: 18026825
Wingate MS, Barfield WD.Wingate MS, et al. Among authors: barfield wd.Matern Child Health J. 2011 Nov;15(8):1135-42. doi: 10.1007/s10995-010-0665-9.Matern Child Health J. 2011.PMID: 20740309