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URL: http://scholar.google.com/scholar_lookup?title=A+subset+of+patients+destined+to+develop+spontaneous+preterm+labor+has+an+abnormal+angiogenic%2Fanti-angiogenic+profile+in+maternal+plasma%3A+evidence+in+support+of+pathophysiologic+heterogeneity+of+preterm+labor+derived+from+a+longitudinal+study.&year=2009&author=Chaiworapongsa&journal=J+Matern+Fetal+Neonatal+Med.&volume=22&issue=12&pages=1122-1139&doi=10.3109%2F14767050902994838&pmid=19916710