aDivision of Pediatric Cardiology, bDotter Interventional Institute and cDepartment of Diagnostic Radiology, Oregon Health & Science University, Portland, Oregon, USA Correspondence and requests for reprints to David J. Sahn MD, 3181 Southwest Sam Jackson Park Road, L608, Oregon Health & Science University, Portland, Oregon, 97201, USA. Tel: +1 503 494 2191; fax +1 503 494 2190
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Burch et al. (2001) studied this question.
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