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aDivision of Cardiovascular Surgery, Department of Surgery, University of Pennsylvania, Philadelphia, Pennsylvania
bVagelos College of Physicians and Surgeons, Columbia University, New York City, New York, USA
Correspondence to Edward Cantu III, MD, University of Pennsylvania, Silverstein 6, 3400 Spruce St, Philadelphia, PA 19104, USA. Tel: +1 267 847 2868; fax: +1 215 349 5789; e-mail: [email protected]
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