* Division of Vascular Surgery, Northwestern Memorial Hospital, and Northwestern University, The Feinberg School of Medicine, Chicago, IL, USA **Correspondence address: William H Pearce, MD, 201 E Huron, #10-105, Chicago, IL 60611, USA. Received November 21, 2002; accepted November 21, 2002.
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William H. Pearce (2003) studied this question.
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