Research standardization tools: pregnancy measures in the PhenX Toolkit by Malinowski, Ann Kinga, MD, MSc, Ananth, Cande V., PhD, MPH, Catalano, Patrick, MD, Hines, Erin P., PhD, Kirby, Russell S., PhD, Klebanoff, Mark A., MD, Mulvihill, John J., MD, Simhan, Hyagriv, MD, MS, Hamilton, Carol M., PhD, Hendershot, Tabitha P., BA, Phillips, Michael J., MS, Kilpatrick, Lisa A., MS, Maiese, Deborah R., MPA, Ramos, Erin M., PhD, Wright, Rosalind J., MD, Dolan, Siobhan M., MD, MPH

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