title: The learning curve associated with transapical aortic valve implantation.
authors: Kerckhoff Clinic, Department of Cardiac Surgery, Bad Nauheim, Germany; ; Heartcenter University of Leipzig, Department of Cardiac Surgery, Heartcenter University of Leipzig, Department of Cardiology, Leipzig, Germany.
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authors: Kempfert
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authors: A
authors: Linke
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authors: G
authors: Schuler
authors: Friedrich Wilhelm
authors: FW
authors: Mohr
authors: Thomas
authors: T
authors: Walther
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