This section of the journal is designed to present constructive comments on investigations which are reported in the world literature and which are within the scope ofINVESTIGATIVE RADIOLOGY. In each case the authors of the original articles are given the opportunity to respond to the comments of the reviewers. The readers ofINVESTIGATIVE RADIOLOGYare invited to take part in the open exchange of opinions through Letters to the Editor.
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