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Two children who died in separate incidents this summer at Walt Disney World were both victims of irregular heartbeats linked to natural causes, the medical examiner's office said. A 4-year-old who died in June after going on the rocketship ride "Mission: Space" at Epcot had an abnormal thickening of his heart muscle caused by a condition present since birth, doctors said Tuesday. A 12-year-old girlwho suddenly collapsed at the Typhoon Lagoon water park in August died from arrhythmia caused by an early-stage viral heart infection, officials also determined.
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