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Univ Duisburg Essen, West German Heart & Vasc Ctr Essen, Dept Thorac & Cardiovasc Surg, Hufelandstr 55, D-45122 Essen, Germany Univ Duisburg Essen, West German Heart & Vasc Ctr Essen, Dept Thorac & Cardiovasc Surg, Hufelandstr 55, D-45122 Essen, Germany