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Johanna Aiken's doctor called her pregnancy picture perfect. But when she went into labor at 38 weeks, a complication she knew very little about came on suddenly and threatened her life. Preeclampsia affects seven to 10 percent of pregnant women and can range from very mild to potentially fatal for both the mother and the baby. Aiken is the coordinator for Sunday's Chicago Promise Walk in Busse Woods, one of 36 walk and 5k run events being held nationwide in May as part of Preeclampsia Awareness Month.