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HeartWare International Inc. sank more than 9 percent after-hours Tuesday after it said fourth-quarter 2013 revenue may fall short of market forecasts. The stock fell nearly 1 percent more Wednesday. The Framingham company expects revenue of $53 million for the period, bringing its full-year forecast to $208 million. Analysts were anticipating $58 million for the quarter and $213 million for the year.