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Clifton VL, Gu Q, Murphy VE, Schwartz J, Madsen G, Smith R.Clifton VL, et al. Among authors: schwartz j.Placenta. 2000 Nov;21(8):782-8. doi: 10.1053/plac.2000.0570.Placenta. 2000.PMID: 11095927
Gu Q, Clifton VL, Schwartz J, Madsen G, Sha J, Smith R.Gu Q, et al. Among authors: schwartz j.Chin Med J (Engl). 2001 Jun;114(6):618-22.Chin Med J (Engl). 2001.PMID: 11780439
Szarek E, Farrand K, McMillen IC, Young IR, Houghton D, Schwartz J.Szarek E, et al. Among authors: schwartz j.J Physiol. 2008 Feb 15;586(4):1185-94. doi: 10.1113/jphysiol.2007.141523. Epub 2007 Dec 20.J Physiol. 2008.PMID: 18096603Free PMC article.