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From the Departments of Thoracic and Cardiovascular Surgery and Cardiology, Wonkwang University Hospital, Iksan, South Korea. Submitted for publication January 13, 2000. Accepted for publication May 17, 2000. Address for reprints: Jong Bum Choi, MD, Department of Thoracic and Cardiovascular Surgery, Wonkwang University Hospital, 344-2 Sinyong-dong, Iksan, Jeonbuk, South Korea; email: [email protected]
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Choi et al. (2001) studied this question.