Submitted on: 04 December 2000.
Revised on: 30 December 2000.
Accepted on: 09 January 2001.
JOURNAL OF ULTRASOUND IN MEDICINE
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Submitted on: 04 May 2000.
Revised on: 11 June 2000.
Accepted on: 16 June 2000.
JOURNAL OF ULTRASOUND IN MEDICINE